Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c11b120eda76450…

MALICIOUS

PDF

46.2 KB Created: 2020-08-25 03:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75e6c4b21f018bf746364d0e98cd173f SHA-1: f3daec53ffed707b6ae7c366ff2812c03b95097f SHA-256: 6c11b120eda7645000bfc40d0b51d2804681abe09984ce5b33a378eec92fb317
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, disguised as a 'video player vlc for pc' download. The document body and embedded links suggest a lure to trick users into visiting malicious sites. The ML classifier strongly indicated maliciousness, and the presence of a redirector link points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.com/pify?keyword=video+player+vlc+for+pc
    • http://gepekiz.thesevensolution.com/uploads/1/3/0/9/130969060/e1fb786bff.pdf
    • http://files.holmesrenovationsandrepairsllc.com/uploads/1/3/1/4/131437064/vimisu_bovumabekisime_luleleb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/5654/6467/files/aprender_italiano_completo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/damipibatosalabikenaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/0911/3253/files/vumudupefoforibuperuwe.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1637/files/abap_for_sap_hana.pdf
    • https://cdn.shopify.com/s/files/1/0434/2225/3208/files/11548363643.pdf
    • https://cdn.shopify.com/s/files/1/0432/0159/3502/files/gibaxevanaje.pdf
    • https://cdn.shopify.com/s/files/1/0430/3601/6803/files/fobiduritagen.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0092/files/19210278674.pdf
    • https://cdn.shopify.com/s/files/1/0437/8987/7405/files/51473862631.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ac9.bin
dd4ccfde55c5d7bc6856480f8f8a5ea1cf5bd2ad4f94acac5ac688d149fe4644		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC9 4700 bytes
font_01_sfnt_off00007ae2.bin
400227d38953ffd8d3f5932c2b13b3f1d5d331a75096ba806243a9c951f0eafb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE2 10392 bytes
font_02_sfnt_off00009e69.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E69 4324 bytes

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