Malicious PDF — malware analysis report

Static analysis result for SHA-256 78446ce067e0da19…

MALICIOUS

PDF

115.3 KB Created: 2020-08-25 07:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 083c3778facc870b5e73a8fe85532e00 SHA-1: 9685b628bb3e187806a7fe5a780cf36d5b99b35a SHA-256: 78446ce067e0da1984bdb8ad9bdd71dd647790b1e06558d7c55044d97bf324d3
242 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which are part of a link farm designed to improve search engine ranking, and one malicious redirector link. The document body, though heavily obfuscated, contains text suggesting it is a lure for 'Classzone answers Spanish 3' and includes a URL pointing to a malicious redirector. This combination strongly indicates an advance-fee scam or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=classzone+answers+spanish+3
    • http://files.izacshome.com/uploads/1/3/2/3/132302987/lisetusarej.pdf
    • http://pataf.carmenvanhaeren.com/uploads/1/3/0/8/130814328/dakusiforepud.pdf
    • http://files.supernaturalentertamitedproductions.org/uploads/1/3/1/4/131455883/visemomitowezij-fezaweku-xevut-kixivim.pdf
    • http://files.dconleyphotography.com/uploads/1/3/2/6/132696483/2640839.pdf
    • http://files.jamesfarrell.org/uploads/1/3/2/3/132303316/negenamesiri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7823/8886/files/cbs_local_program_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/8999/3621/files/full_album_bts_face_yourself.pdf
    • https://cdn.shopify.com/s/files/1/0430/7763/2149/files/captain_america_2014_dual_audio.pdf
    • https://cdn.shopify.com/s/files/1/0430/8310/4409/files/typescript_formatter_vscode.pdf
    • https://cdn.shopify.com/s/files/1/0435/6666/1800/files/xipev.pdf
    • https://cdn.shopify.com/s/files/1/0434/8909/9938/files/wunutiwujosovorako.pdf
    • https://cdn.shopify.com/s/files/1/0433/7028/3166/files/bilirubin_test_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0431/2337/6277/files/59607645322.pdf
    • https://cdn.shopify.com/s/files/1/0433/1218/5499/files/26957405612.pdf
    • https://cdn.shopify.com/s/files/1/0435/2363/7399/files/coordinating_conjunction_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/7338/8190/files/41286139939.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_off00017b6c.bin
040088c794b2eefefc0638d99dce442bb1db8b2dcea56f9d8e3e690830dcf4b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17B6C 5120 bytes
font_01_sfnt_off00018ce5.bin
9533ae0e06fed0764338d75b077ca0e3b17040b46260c8ef7bb8144b92745048		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18CE5 16340 bytes

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