Malicious PDF — malware analysis report

Static analysis result for SHA-256 622ad4616c716758…

MALICIOUS

PDF

37.0 KB Created: 2020-08-18 16:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a935aad6c3d7ea76a9ddfe5f7b612f2 SHA-1: 20ba6880fe6fdf9cea28db13868b86e82a32f94b SHA-256: 622ad4616c716758ee6dd2f9eb36843f225a8ad99603e950d0326160f98f93b3
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to a link farm designed for SEO manipulation. One critical link directs to a known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=esic+challan+format+in+excel'. The document's content, though heavily obfuscated, appears to be a lure related to 'esic challan format in excel', aiming to trick users into clicking the malicious links.

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=esic+challan+format+in+excel
    • http://files.alightalive.com/uploads/1/3/2/7/132712050/gogusafewap.pdf
    • http://files.drmonicamody.com/uploads/1/3/0/7/130775866/faboza.pdf
    • http://files.robirving.ca/uploads/1/3/1/4/131411474/lumagewe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/2819/3184/files/71160874310.pdf
    • https://cdn.shopify.com/s/files/1/0429/7873/8335/files/87481009476.pdf
    • https://cdn.shopify.com/s/files/1/0436/5497/1557/files/boxebow.pdf
    • https://cdn.shopify.com/s/files/1/0439/3969/2699/files/13961635669.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45484104345.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87463685859.pdf
    • https://cdn.shopify.com/s/files/1/0432/3491/8558/files/gepew.pdf
    • https://cdn.shopify.com/s/files/1/0437/0527/0427/files/72651488270.pdf
    • https://cdn.shopify.com/s/files/1/0440/7132/1752/files/80641254532.pdf
    • https://cdn.shopify.com/s/files/1/0434/3093/6733/files/zuzebukowipobuwita.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/great_quotes_about_life.pdf
    • https://cdn.shopify.com/s/files/1/0441/3505/5512/files/appareil_respiratoire_anatomie.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_off00004743.bin
d0cdde182c393c9bcd5dff296bc7aa113776e8c98b7aa14fd48c8244ecd10f65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4743 4932 bytes
font_01_sfnt_off000057cb.bin
a74ee65c83de3b850263ffab5b929474166d37b319f68390e53675896cdec31d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57CB 9748 bytes
font_02_sfnt_off0000792f.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x792F 4324 bytes

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