Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ae01207d092d0f…

MALICIOUS

PDF

40.8 KB Created: 2020-08-23 06:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00a9a098d6d45d8258463f3eded00a1a SHA-1: b48b4f8b40100120c1381b484f15e15397c2df23 SHA-256: 11ae01207d092d0fc0e9ec58f5efd609b17f9750178ebb56710ee8c1e34b23f2
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to benign Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'Casio 991 calculator manual' and the malicious URL, suggesting a lure for SEO spam or phishing. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=casio+991+calculator+manual
    • http://files.jcardinahlprints.com/uploads/1/3/0/7/130775784/bogekokedezalu.pdf
    • http://files.cockburnarchitecture.co.uk/uploads/1/3/1/4/131453302/48d552374b.pdf
    • http://files.adimef.com/uploads/1/3/1/4/131437123/sewexazurobada_litatu_zotowofefu_puvifapik.pdf
    • http://zatereb.inkonivory.ca/uploads/1/3/1/3/131383297/a8cab5ed24.pdf
    • http://files.merrellmusic.com/uploads/1/3/0/7/130776394/8517037.pdf
    • http://edu.casio.comCASIO
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/5165/6102/files/gonuvujixusox.pdf
    • https://cdn.shopify.com/s/files/1/0459/8978/9853/files/attack_on_mumbai_26_11_full_movie.pdf
    • https://cdn.shopify.com/s/files/1/0462/4374/1845/files/74420391526.pdf
    • https://cdn.shopify.com/s/files/1/0437/5963/2545/files/behavioral_interview_questions_and_answers_examples.pdf
    • https://cdn.shopify.com/s/files/1/0429/5432/6179/files/35095697941.pdf
    • https://cdn.shopify.com/s/files/1/0433/9721/8471/files/bulking_for_endomorphs.pdf
    • https://cdn.shopify.com/s/files/1/0433/3774/4534/files/44831012826.pdf
    • https://cdn.shopify.com/s/files/1/0438/9850/3336/files/56313013059.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/github_change_remote_origin.pdf
    • https://cdn.shopify.com/s/files/1/0430/8526/7097/files/sql_server_2020_interview_questions.pdf
    • https://cdn.shopify.com/s/files/1/0439/5902/5822/files/6344844153.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/89044545660.pdf
    • https://cdn.shopify.com/s/files/1/0435/9369/5391/files/92306087089.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062c4.bin
a72ade7c9e7c92514a392b7e6d45f253b3ea932bc52b17127c44c4e2612d7458		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C4 5056 bytes
font_01_sfnt_off000073da.bin
a265e747aedb91f26940f3d0a01aa7206f7d89d7db19682fec0b91049e0432a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73DA 10208 bytes

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