Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b72e2ae35fab55…

MALICIOUS

PDF

89.7 KB Created: 2020-08-06 23:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7afefcce94c2533f9abaed6230d2d6a SHA-1: 8cacd6ebd4b5e681b45f4fded12a90a6959fd52a SHA-256: 28b72e2ae35fab5534881384f6957cc0bf08f643dc078884437c94fdad3bcfa1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains the same malicious URL. This suggests the primary goal is to redirect the user to a malicious site, likely for phishing or further malware delivery. 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=4th+grade+math+teks+pdf
    • http://files.purplepoise.com/uploads/1/3/0/9/130969847/folewuzes.pdf
    • http://files.dunphyshandguntraining.com/uploads/1/3/2/6/132681566/d354c601d.pdf
    • http://files.thehouseon10th.com/uploads/1/3/2/6/132683121/wisijurofa_wadenodonapawu_ridew_vudevufu.pdf
    • https://cdn.shopify.com/s/files/1/0430/1229/2767/files/generate417_barcode_android.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/49536452742.pdf
    • https://cdn.shopify.com/s/files/1/0431/1144/8727/files/ms_office_for_ubuntu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/76912545620.pdf
    • https://cdn.shopify.com/s/files/1/0433/3908/8027/files/bass_guitar_walking_bass_lines.pdf
    • https://cdn.shopify.com/s/files/1/0436/5592/1817/files/27907408188.pdf
    • https://cdn.shopify.com/s/files/1/0434/3142/8248/files/fundamentals_of_radiation_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0434/8523/3302/files/japimoxeri.pdf
    • https://cdn.shopify.com/s/files/1/0434/4456/8216/files/full_cardiovascular_examination.pdf
    • https://cdn.shopify.com/s/files/1/0429/5049/2316/files/65008492060.pdf
    • https://cdn.shopify.com/s/files/1/0428/7610/8956/files/42059618720.pdf
    • https://cdn.shopify.com/s/files/1/0429/5157/3657/files/raxetovin.pdf
    • https://cdn.shopify.com/s/files/1/0434/8857/5638/files/70394677546.pdf
    • https://cdn.shopify.com/s/files/1/0429/0566/5703/files/wosurewosefev.pdf
    • https://cdn.shopify.com/s/files/1/0430/1383/2857/files/rinizijoroxot.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_off00012420.bin
68da6c6d760de9114604616ece758b408d59cdaa7d9368df51ad17250124f570		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12420 5480 bytes
font_01_sfnt_off0001369e.bin
27671c9581b0ea454245546ae70d4b362fd48c9de4d8f17964c7f05d2a244698		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1369E 10180 bytes

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