Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1a4220d9cb4e8f…

MALICIOUS

PDF

40.1 KB Created: 2020-08-31 05:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3aee691c149258016db257c10e0e8cc5 SHA-1: 2b796a2fa11baf6a80257a0117d09f80dd47514d SHA-256: 6e1a4220d9cb4e8f3fcc43e8229889236f4a61a6ca93206b0f06ed80074892bd
174 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure for "elementary information security download" and includes the malicious URL. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs and the redirector link suggest an attempt to lead the user to a malicious site, likely for further exploitation or credential harvesting.

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.ru/wix?keyword=elementary+information+security+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/c63dba_f5e26fca427d43ff9aeb08e18e9b3780.pdf
    • https://static.usrfiles.com/ugd/ca32a8_18068ec536fd4ebe9e9eecd183b43b53.pdf
    • https://static.usrfiles.com/ugd/b8c837_b100a3be4a034c869ea71974aaa80930.pdf
    • https://static.usrfiles.com/ugd/e7e4a0_ebe629edc3d446329c146b6870f98039.pdf
    • https://static.usrfiles.com/ugd/b8c837_3efbe504d00347aab7220c1f316c624b.pdf
    • https://cdn.shopify.com/s/files/1/0432/6090/3582/files/rieju_toreo_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/5238/1846/files/synonyms_and_antonyms_for_ssc_exam.pdf
    • https://cdn.shopify.com/s/files/1/0434/3214/9148/files/bizumemedewujigaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/1586/3447/files/domanibun.pdf
    • https://cdn.shopify.com/s/files/1/0437/6923/3557/files/psychology_textbook_class_11_ncert.pdf
    • https://cdn.shopify.com/s/files/1/0438/7989/1099/files/android_emulator_ringan_laptop.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fofigez.pdf
    • https://cdn.shopify.com/s/files/1/0432/0857/3091/files/contoh_soal_report_text_dan_artinya.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/besijegafod.pdf
    • https://cdn.shopify.com/s/files/1/0428/6559/0438/files/the_anti_inflammation_diet_and_recipe_book.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_off00005e1b.bin
ef8c394d3c66e7355d3c47c7dd280ca6fdfe6b5e2f21f1a385e8145109445a00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E1B 5320 bytes
font_01_sfnt_off0000702f.bin
b896e831d5c1f399f359880a90f7f123c65655efefd44b9afc24a8a79950fd66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x702F 10336 bytes

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