Malicious PDF — malware analysis report

Static analysis result for SHA-256 67ebd919c2756ff1…

MALICIOUS

PDF

41.7 KB Created: 2020-08-05 04:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0615f840fdd13bbe0d0ec2b747289da5 SHA-1: cafd25fd67d7f3c08d95c65e9fb0d66775e1cba9 SHA-256: 67ebd919c2756ff10035b1f92c9251fd9f3c7c1e23d37096202fd39f0a3aff6d
154 Risk Score

Malware Insights

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

The PDF document contains numerous links, including one to a known malicious redirector at `https://ttraff.com/pify?keyword=k+l+chung+elementary+probability+theory+pdf`. This suggests the document is designed to lead users to malicious content, likely for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

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=k+l+chung+elementary+probability+theory+pdf
    • http://files.bishopscience.net/uploads/1/3/1/4/131406841/7831314.pdf
    • http://foxeteva.duffysdachshunds.com/uploads/1/3/1/4/131409090/gunavi.pdf
    • http://files.tomboumanlaw.com/uploads/1/3/2/6/132683137/6431921.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/0708/1630/files/45844342013.pdf
    • https://cdn.shopify.com/s/files/1/0433/9171/3447/files/3029836889.pdf
    • https://cdn.shopify.com/s/files/1/0428/9524/5475/files/56791239446.pdf
    • https://cdn.shopify.com/s/files/1/0433/2670/1723/files/fujiruru.pdf
    • https://cdn.shopify.com/s/files/1/0429/6795/7660/files/aide_soignante_cours.pdf
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/tidesurotu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9542/5191/files/kidevozasofep.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/sowafuxixefafisexajemepip.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0820/files/tawanogejug.pdf
    • https://cdn.shopify.com/s/files/1/0430/3906/4225/files/download_nsfas_application_form_for_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/6085/3920/files/83402127064.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/32527754718.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000533d.bin
032c9ea02a461da46ba4ddb652299f86c64054cef68a4df3f42c96fc82b51e28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x533D 5484 bytes
font_01_sfnt_off000065ac.bin
25cd5699d8597e99e6fdbc9834ac166b0222a05522e9adc299f881a0f011f2c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65AC 11480 bytes
font_02_sfnt_off00008ba7.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA7 4324 bytes

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