Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a609feb4813f86c…

MALICIOUS

PDF

37.6 KB Created: 2020-08-25 02:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f508036ef8d59028545ae4898fc72cd4 SHA-1: 4c4c2fbc9063b1a9eff5ed155392f9d6343607bd SHA-256: 1a609feb4813f86c3a3a53546423a421c6420da53f13630d7d8aaddd58503b15
152 Risk Score

Malware Insights

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

The PDF file was flagged by a critical heuristic for linking to known malicious redirector infrastructure and for containing a large link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs, particularly the one pointing to 'ttraff.ru', suggest a redirection to potentially harmful content. The document body contains text related to 'Equivalent expressions worksheet grade 2' and includes the primary malicious URL, indicating a lure to disguise the malicious intent.

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=equivalent+expressions+worksheet+grade+2
    • http://files.raquelharrington.com/uploads/1/3/1/8/131856186/siwipevonuvasagor.pdf
    • http://files.homehotyoga.com/uploads/1/3/1/4/131483307/malogunisotugu_zofuwumo_papopuremagefa.pdf
    • http://sijotexun.graceforthebroken.org/uploads/1/3/2/6/132695780/vexemawepogu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5815/1070/files/mathematics_for_economists_notes.pdf
    • https://cdn.shopify.com/s/files/1/0433/5271/9515/files/pravastatin_davis_drug.pdf
    • https://cdn.shopify.com/s/files/1/0436/4628/8025/files/zovamab.pdf
    • https://cdn.shopify.com/s/files/1/0441/3066/4600/files/88796687579.pdf
    • https://cdn.shopify.com/s/files/1/0449/3754/3848/files/action_figures_price_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/3901/4562/files/kubivukofugudegumepez.pdf
    • https://cdn.shopify.com/s/files/1/0428/3521/4503/files/65575352450.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8037/files/space_maintainers_in_pediatric_dentistry.pdf
    • https://cdn.shopify.com/s/files/1/0435/8579/8301/files/70136248790.pdf
    • https://cdn.shopify.com/s/files/1/0437/7418/1537/files/graphic_design_tutorial_bangla_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/0300/9430/files/xokidilopom.pdf
    • https://cdn.shopify.com/s/files/1/0433/8237/4561/files/gozobojinarosagola.pdf
    • https://cdn.shopify.com/s/files/1/0432/9183/6566/files/38444619785.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_off000053a0.bin
3865092bed4b5a8474b8a475cccbc6e6134318c68a01145cbbe297807c8e2f6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53A0 5720 bytes
font_01_sfnt_off0000672b.bin
57017fca7cefd429b7fdb845aa7109fc51923483925d333b495097ee5984294a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x672B 9948 bytes

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