Malicious PDF — malware analysis report

Static analysis result for SHA-256 136760fc0cc3fd00…

MALICIOUS

PDF

39.3 KB Created: 2020-09-17 03:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01463287bd91683a4726e9ea0bcb6a6f SHA-1: 18a05eb095655a00e81d01972da4285ee05ca941 SHA-256: 136760fc0cc3fd007e833701df861e77a3740a73a34743d8fe01028e5c146de5
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a background check service. The document body, though heavily obfuscated, contains the same URL, indicating an attempt to direct the user to malicious infrastructure. The presence of numerous other PDF links suggests a link farm or SEO poisoning tactic to increase visibility.

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=cps+background+check+maryland
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ddd3045d-d77d-4598-815f-891a041f1dfc.filesusr.com/ugd/66f3f9_85d17334f750400b9453c963d6f25645.pdf?index=true
    • https://84369160-43ed-4779-b1a9-4e3027ce7982.filesusr.com/ugd/7d1dc9_be51917577a04c3c8b035410bb3227be.pdf?index=true
    • https://a25bf710-3a88-46da-808d-4039c96fe379.filesusr.com/ugd/4c1554_af712df359c2435a9e9298cc6aaa8a02.pdf?index=true
    • https://5f3be8ea-0f7d-4bff-a09c-1c3aed87a42b.filesusr.com/ugd/b4a829_adc6edce45294eafae72e53cd7cc6fa5.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0434/4807/4405/files/dezidupitaxanexozej.pdf
    • https://cdn.shopify.com/s/files/1/0432/2027/1272/files/template_leaflet_microsoft_word.pdf
    • https://cdn.shopify.com/s/files/1/0430/8484/1124/files/jurowotoxugagoboruxagedil.pdf
    • https://cdn.shopify.com/s/files/1/0437/2470/1847/files/cerveza_corona_historia.pdf
    • https://cdn.shopify.com/s/files/1/0433/8732/2522/files/caterpillar_generator_sets.pdf
    • https://cdn.shopify.com/s/files/1/0478/0825/0015/files/dawefazoteditosubanor.pdf
    • https://cdn.shopify.com/s/files/1/0446/7376/1433/files/amleto_italiano.pdf
    • https://cdn.shopify.com/s/files/1/0434/1019/4582/files/tijipuso.pdf
    • https://cdn.shopify.com/s/files/1/0437/7611/4837/files/vaxak.pdf
    • https://cdn.shopify.com/s/files/1/0432/1217/7563/files/70194817552.pdf
    • https://cdn.shopify.com/s/files/1/0459/9057/6285/files/desperate_housewives_season_5_episode_1.pdf
    • https://cdn.shopify.com/s/files/1/0428/9092/0099/files/64761139185.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_off0000594a.bin
573dd203f2b592dbcc300fdd606a27a68b2c5e36ea82483f138d653b810a462a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x594A 5700 bytes
font_01_sfnt_off00006c87.bin
9a5cc978480e983b14bb5a5469f26c735e324bc148854d54c075482bf1d01e27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C87 10472 bytes

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