Malicious PDF — malware analysis report

Static analysis result for SHA-256 798187456506a18f…

MALICIOUS

PDF

37.1 KB Created: 2020-08-07 03:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5d61aec93439db1ee4e005c91dff88c SHA-1: 82f6d51edfe7db13e7c57ea1011fc6bffdc6d665 SHA-256: 798187456506a18fc652346dc4d4546491745d578f0f6785f2db461bf695e6f6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains text suggesting a lure for a free PDF, which aligns with the redirector's purpose. 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.cc/pify?keyword=forbidden+psychology+101+free+pdf
    • http://files.jocelynoades.com/uploads/1/3/1/4/131483148/ridasosaxufax-filipuzabomid.pdf
    • http://files.fpclewisburg.org/uploads/1/3/0/8/130874250/9209f9a1f2.pdf
    • http://nikumewux.guardianreporting.com/uploads/1/3/1/4/131454012/4934051.pdf
    • http://files.acutabovesalonvanwa.com/uploads/1/3/0/7/130776077/voriwi_gogikowawapuwe_kedarefa_jazuginu.pdf
    • http://files.krystlewong.com/uploads/1/3/1/4/131437669/kiwasutemumowod_rejeki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8850/2174/files/45313534342.pdf
    • https://cdn.shopify.com/s/files/1/0432/4609/2443/files/tavatonaripox.pdf
    • https://cdn.shopify.com/s/files/1/0431/2114/8061/files/53086680316.pdf
    • https://cdn.shopify.com/s/files/1/0438/1740/2530/files/94824303659.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/76455867455.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3024/files/rodamuxudaxazodasiledi.pdf
    • https://cdn.shopify.com/s/files/1/0428/8934/7228/files/is_ssundee_rich.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4063/files/pavivafefibewiw.pdf
    • https://cdn.shopify.com/s/files/1/0435/3523/7269/files/dish_dash_milpitas.pdf
    • https://cdn.shopify.com/s/files/1/0436/5035/1257/files/bosch_oil_filter_cross_reference_chart.pdf
    • https://cdn.shopify.com/s/files/1/0431/6689/2191/files/91962440480.pdf
    • https://cdn.shopify.com/s/files/1/0438/3404/8669/files/xizemeremugogeboje.pdf
    • https://cdn.shopify.com/s/files/1/0437/2001/6024/files/83253147331.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_off00005298.bin
d61dc04b29432ec8214a049980b62a7285a2cc98cb22aaca0e3cf5e31a2db86c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5298 5596 bytes
font_01_sfnt_off000065b0.bin
5012768366d023319189a8982b0a621e3e6de1798b4992c5630e74d0b57de182		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B0 9792 bytes

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