Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa410de0837d506…

MALICIOUS

PDF

39.6 KB Created: 2020-08-30 20:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a4e4d7f7426c11f2fa5e3f6c3c705b7 SHA-1: ad4756562389de231311ef1c9debbe9a78e84884 SHA-256: 5fa410de0837d50694dcd2bd47998a54eae3f8bca9fafe8181c49ef32834cfc5
174 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO spam operation. One prominent URL, 'https://ttraff.com/wix?keyword=envision+math+2.0+grade+6+teacher+ed', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to educational material and the malicious URL, indicating a lure to drive traffic to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/wix?keyword=envision+math+2.0+grade+6+teacher+ed
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2067/3433/files/tavegakonew.pdf
    • https://cdn.shopify.com/s/files/1/0433/8375/0814/files/farotelugavafipiv.pdf
    • https://cdn.shopify.com/s/files/1/0438/3142/7234/files/73612014245.pdf
    • https://cdn.shopify.com/s/files/1/0435/6318/8383/files/13959827598.pdf
    • https://cdn.shopify.com/s/files/1/0435/0004/4440/files/64455779218.pdf
    • https://cdn.shopify.com/s/files/1/0435/2458/7674/files/zejewegarorelab.pdf
    • https://cdn.shopify.com/s/files/1/0430/8015/5290/files/zikox.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/ielts_band_9_writing_task_1.pdf
    • https://cdn.shopify.com/s/files/1/0434/6681/7689/files/83506089056.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bapumonotirugapagemuzigin.pdf
    • https://static.usrfiles.com/ugd/63022f_c833beb8aa98423a966bdce28a5a6ca9.pdf
    • https://static.usrfiles.com/ugd/b8c837_59ea315c6e2249a7b59a97cd758be3dc.pdf
    • https://static.usrfiles.com/ugd/10b11f_a8392646b8f945ad89cd3490284310b1.pdf
    • https://static.usrfiles.com/ugd/06497e_a77a0a744573433caa911cbeb9313afe.pdf
    • https://static.usrfiles.com/ugd/36f25b_297905fcef0c444395dd3a80304ef7d4.pdf
    • https://static.usrfiles.com/ugd/52b593_4103fc7897d344f0b619afd554cace14.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b93.bin
a497fc52ef216d2369a1cda088bdeb49e1b2edea4e2999984a7939df6a238a3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B93 6416 bytes
font_01_sfnt_off00005b5d.bin
5cfe41839bcef7a8d1ec68a29187b5eabd40c0c10135c7ffd3a672876fb8dccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B5D 5796 bytes
font_02_sfnt_off00006ef4.bin
1860a6648d7a8862e098d158ee779b73201c692794b86925a1bb6f585a30c73a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF4 9856 bytes

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