Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ff004b47508fce…

MALICIOUS

PDF

42.0 KB Created: 2020-08-06 11:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0beae038f7db86d27942e40e1d8d13f4 SHA-1: 4001ef3946af4a0ca250c1b946cbff8ba8444695 SHA-256: 70ff004b47508fceeccb1ad77df1fffc306bbd8835a0416fab0e37a30aeeaba6
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary one leading to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL and text as the link, suggesting a lure to trick users into clicking. The presence of many other PDF links points towards a link farm or SEO manipulation tactic, likely to obscure the malicious intent. No scripts were extracted, but the embedded links are sufficient to classify this as malicious.

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.ru/pify?keyword=how+alcohol+affects+the+body+pdf
    • http://files.editionalicesutton.com/uploads/1/3/2/7/132741430/gesukevami_siwolasuzumavu_welosowukabara.pdf
    • http://jowumil.illuminatingideas.org/uploads/1/3/0/7/130776131/4857801.pdf
    • http://files.davidholdsworthauthor.com/uploads/1/3/1/3/131380666/9739747.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5430/8257/files/40872905141.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/gosofasukifa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1551/1968/files/92463733176.pdf
    • https://cdn.shopify.com/s/files/1/0437/7496/7965/files/92628557789.pdf
    • https://cdn.shopify.com/s/files/1/0433/8538/9206/files/lixokidozefus.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/46886478239.pdf
    • https://cdn.shopify.com/s/files/1/0435/9107/3947/files/31008724822.pdf
    • https://cdn.shopify.com/s/files/1/0432/1063/7475/files/10307728497.pdf
    • https://cdn.shopify.com/s/files/1/0428/1001/5910/files/73204202987.pdf
    • https://cdn.shopify.com/s/files/1/0431/1000/6940/files/gajivosarefuli.pdf
    • https://cdn.shopify.com/s/files/1/0430/5957/6986/files/alice_in_wonderland_full_script.pdf
    • https://cdn.shopify.com/s/files/1/0436/2086/0064/files/45028608393.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_off0000668b.bin
d21defcea7f8acdf29ceac280ac1f4da24bf6435b3e49ef0257dda3b31257ec9
pdf-font-stream PDF embedded font (sfnt) at offset 0x668B 5440 bytes
font_01_sfnt_off0000791f.bin
4dbf9d37a8b069fac8a7eb813be247e2905e2be04f76e7cd48c3105a3a188104
pdf-font-stream PDF embedded font (sfnt) at offset 0x791F 9948 bytes