Malicious PDF — malware analysis report

Static analysis result for SHA-256 17adc900857052c2…

MALICIOUS

PDF

45.7 KB Created: 2020-07-30 14:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3713a90d17a6710370f84fdc44456b51 SHA-1: aff66e95468aede1bf818c0fc47fd7cea87ad960 SHA-256: 17adc900857052c2006e9c03e1ca5a2a57ec649046261c654805d63f26fd01f6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The heuristic firings indicate this PDF is part of a link farm, likely for SEO manipulation or to distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.com/pify?keyword=cardiopulmonary+physical+therapy+a+guide+to+practice+pdf
    • http://files.georgiafirstgen.org/uploads/1/3/1/6/131636725/235a9806041f06a.pdf
    • http://files.meinradrottweilers.com.au/uploads/1/3/1/4/131407796/4141642.pdf
    • http://files.artoframachandran.com/uploads/1/3/0/7/130775373/b602ca8.pdf
    • http://files.oakstreetart.com/uploads/1/3/1/4/131453610/3463308.pdf
    • http://files.twohandsrescue.org/uploads/1/3/1/4/131407877/18d68b9c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5504/6037/files/65454150208.pdf
    • https://cdn.shopify.com/s/files/1/0440/6041/0021/files/87369405493.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wadilizesiwegokadokepub.pdf
    • https://cdn.shopify.com/s/files/1/0429/2021/4681/files/zixavuvegaralikonuduv.pdf
    • https://cdn.shopify.com/s/files/1/0433/5524/2655/files/68354494490.pdf
    • https://cdn.shopify.com/s/files/1/0432/6883/3436/files/fudamubafegewefikutoke.pdf
    • https://cdn.shopify.com/s/files/1/0434/1576/5148/files/mutulomamikotukar.pdf
    • https://cdn.shopify.com/s/files/1/0438/1592/7965/files/tutofifimud.pdf
    • https://cdn.shopify.com/s/files/1/0433/0392/7973/files/43780988459.pdf
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/zavipi.pdf
    • https://cdn.shopify.com/s/files/1/0427/7967/2735/files/mupiwe.pdf
    • https://cdn.shopify.com/s/files/1/0429/1883/8435/files/rinotamejoxew.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_off00007289.bin
2de8f96a3dde704737d1029897ea3eaeff313f5b661f011249506e52b3eafaf5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7289 5576 bytes
font_01_sfnt_off00008560.bin
0e1d3f171d148d21299c3d6d387aaadcf400776c2baae38c2cfe37d01496b2a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8560 10328 bytes