Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf42adc832870ac…

MALICIOUS

PDF

36.9 KB Created: 2020-10-28 10:30:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: dac4d9fea57aff0602a37a39e9ec9b0d SHA-1: 4db792bda46bf6a516f7e56cb359f5cdb47345d2 SHA-256: acf42adc832870ac5e291335c2006f8d34d39557050e4d4cb47ec71040076c6c
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same redirector URL and appears to be a lure for academic materials. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL suggests an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.me/123?keyword=ap+calculus+bc+2016+frq In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367627/normal_5f89739b3700f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367304/normal_5f9379e3b60d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366408/normal_5f8fb76a0b68c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368249/normal_5f92fcbad5a89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367297/normal_5f88abb38be3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368478/normal_5f8ba79f824df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374857/normal_5f897ac8e132e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391305/normal_5f94ee705e8fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5f86faa49045f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384628/normal_5f992a49e9417.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402720/normal_5f969e0b722ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369166/normal_5f943a3f8d7ee.pdfIn PDF document text
    • https://debemalimuwu.weebly.com/uploads/1/3/4/3/134385929/niruvet-midof-zimanur.pdfIn PDF document text
    • https://viwuwobigoku.weebly.com/uploads/1/3/1/3/131378942/3013505.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/wezebude.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tetazino/pegidekovavajiko.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/intermediate_english_reading_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/21767423454.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/i_dreamed_a_dream_piano_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/97782812412.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0518/0576/files/hr_pardner_pump_protector.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3441/8586/files/73520446192.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5817/4396/files/launchpad_mobile_apk_pro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/6414/6073/files/gotigubemovamidelu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1257/3344/files/present_continuous_tense_worksheet.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50A6 5744 bytes
SHA-256: 2c857b4f959b62aa55bae1e332faf5aa9abd049aea53113e5f4e2f449cc621be
font_01_sfnt_off0000643d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x643D 9960 bytes
SHA-256: c62a6d7cd2532eb5cf1ad61daf704e17e75f810dcff7370314178cdc213ba053

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