Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73ba7a685e5a3fb…

MALICIOUS

PDF

33.9 KB Created: 2020-08-01 08:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a922673471134c5f214538109c897a3 SHA-1: a24390ce2f1d15ab778849165dc3064e6c1b4d58 SHA-256: f73ba7a685e5a3fbcc6aa682d5e8179ab9bd41471ab0f8fe3f00064f0d14eba5
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=shipping+up+to+boston+lyrics'. Additionally, it features a PDF link farm heuristic, indicating a large number of external links, with the primary one being 'https://cdn.shopify.com/s/files/1/0431/3815/4650/files/dezenoxudiwigip.pdf'. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains these URLs, suggesting the primary attack vector is to trick the user into clicking the malicious redirector.

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.cc/pify?keyword=shipping+up+to+boston+lyrics
    • http://files.thelittleyellowbuilding.com/uploads/1/3/1/4/131453645/lapigigelujalig.pdf
    • http://files.propcustomz.com/uploads/1/3/1/8/131858287/pekipuj-pabamup-morepifav-kisedopuve.pdf
    • http://files.melissaaliss.com/uploads/1/3/0/7/130775633/8622638.pdf
    • http://files.reynoldsyachts.net/uploads/1/3/2/8/132814250/6525321.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4650/files/dezenoxudiwigip.pdf
    • https://cdn.shopify.com/s/files/1/0430/8379/2533/files/91696824439.pdf
    • https://cdn.shopify.com/s/files/1/0434/4895/9141/files/59342849565.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/72315851841.pdf
    • https://cdn.shopify.com/s/files/1/0431/6640/0663/files/mukusa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/jomopebexifupuruxun.pdf
    • https://cdn.shopify.com/s/files/1/0432/8049/8852/files/fanubijamixo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9900/4831/files/62268761192.pdf
    • https://cdn.shopify.com/s/files/1/0431/7252/8292/files/99714238868.pdf
    • https://cdn.shopify.com/s/files/1/0432/7456/7843/files/woleg.pdf
    • https://cdn.shopify.com/s/files/1/0432/7034/0772/files/fenokepiru.pdf
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/26872635093.pdf
    • https://cdn.shopify.com/s/files/1/0430/2045/1997/files/wesofe.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_off0000463b.bin
d199d39743eff09367c8c7e119c2e03a1e54546d050ea9aeccc2827ac1a1270d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x463B 5328 bytes
font_01_sfnt_off00005862.bin
cb7e7c81530a93bba7491a0461c79bba2f875a7f9e930ef5792f0c5bea075447		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5862 9996 bytes

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