Malicious PDF — malware analysis report

Static analysis result for SHA-256 41505079b62328cf…

MALICIOUS

PDF

54.0 KB Created: 2020-09-05 07:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e35972d17cb3a87c71537ab547b3427d SHA-1: ecf7947bc7fbd3c702e60d47c4d48666d6eebd25 SHA-256: 41505079b62328cf75cdfd340e8bd6198253bcff14ecb11d01b1fe7fcb4d0de1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a prominent link to 'ttraff.club' which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'primary school building design plans pdf' and the malicious URL, suggesting a social engineering lure. The presence of numerous external links, many pointing to 'static.usrfiles.com', indicates a link farm strategy to potentially improve search engine ranking or distribute malicious content.

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.club/wix?keyword=primary+school+building+design+plans+pdf
    • https://static.usrfiles.com/ugd/0f1814_c20fccec365e4cf1bbe6b658ddf7fe31.pdf
    • https://static.usrfiles.com/ugd/63022f_4d2004a2b1dc41f38b7b27af97ce23f9.pdf
    • https://static.usrfiles.com/ugd/b91566_b9a4964d8a4140d7845ada6d0dbad336.pdf
    • https://static.usrfiles.com/ugd/c8d394_b208b64c459d441190017852bb5ab5de.pdf
    • https://static.usrfiles.com/ugd/b8c837_dc29d997332d4c2399494376c25d3128.pdf
    • https://static.usrfiles.com/ugd/43d598_d6be00c7a4d046bc96818269423ea6f6.pdf
    • https://static.usrfiles.com/ugd/8b49c6_4c6c950817ab45fca89fa0bd04845548.pdf
    • https://static.usrfiles.com/ugd/2a1429_8767d753a2fa492f86aaefafa70561ca.pdf
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/broken_angel_whatsapp_status_video_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0433/9095/9766/files/75903876400.pdf
    • https://cdn.shopify.com/s/files/1/0440/1650/0886/files/kafofovikibudod.pdf
    • https://cdn.shopify.com/s/files/1/0433/2273/6798/files/95964056625.pdf
    • https://cdn.shopify.com/s/files/1/0431/5385/0528/files/zidijatorumozonodumata.pdf
    • https://cdn.shopify.com/s/files/1/0430/4093/1991/files/subtraction_math_facts_worksheets_grade_1.pdf
    • https://cdn.shopify.com/s/files/1/0464/3110/9272/files/mawajurazibopajowu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7289/6678/files/borges_que_es_el_budismo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/99645384878.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008353.bin
c8aa074c86787a5ff8cd5dc4f7b0401956b906260fd006d7d416bb7fd876757b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8353 5812 bytes
font_01_sfnt_off000096f8.bin
ece02b93c812bee5c63fd6ab1422a04838534c11f39f2c986cf70dc4bdeda857		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96F8 16560 bytes

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