Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab8851cec935557…

MALICIOUS

PDF

43.5 KB Created: 2020-08-08 23:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f449c87cb653745f2305372d6e40ec4f SHA-1: 367236147799ac7340e1a0af6a4d3e89012bbe7f SHA-256: fab8851cec935557aa2237c9ebbadc844b68e09167f702b82080045b7bc5da7d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though malformed, includes the URL 'https://ttraff.cc/pify?keyword=numerical+methods+for+partial+differential+equations+mazumder+pdf', which is likely used to redirect the user to a malicious site. Additionally, the PDF was flagged as a link farm, suggesting a broad distribution effort. No scripts were extracted from this sample.

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=numerical+methods+for+partial+differential+equations+mazumder+pdf
    • http://files.soulsistersphotography.com/uploads/1/3/0/8/130873893/275679.pdf
    • http://files.goodeatsbyjeff.com/uploads/1/3/1/4/131484029/fea94fc.pdf
    • http://nitopeluj.shefaholistic.com/uploads/1/3/1/8/131871721/ef070a1b1.pdf
    • http://files.stanleyjusticeproductions.com/uploads/1/3/0/7/130739263/kiravowonoxe-wotikufa-pafik.pdf
    • http://widegusa.edensipperly.com/uploads/1/3/2/7/132740435/zewigokifafumukipet.pdf
    • https://cdn.shopify.com/s/files/1/0431/5955/2155/files/99483160337.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70998441087.pdf
    • https://cdn.shopify.com/s/files/1/0435/0689/2960/files/3726739777.pdf
    • https://cdn.shopify.com/s/files/1/0433/3967/7861/files/ching_form_space_and_order.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4063/files/adding_similar_fractions_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/0543/6326/files/5552199344.pdf
    • https://cdn.shopify.com/s/files/1/0431/0722/1670/files/difexanemobipejawir.pdf
    • https://cdn.shopify.com/s/files/1/0431/6577/8080/files/83943925412.pdf
    • https://cdn.shopify.com/s/files/1/0431/0482/9589/files/60921650116.pdf
    • https://cdn.shopify.com/s/files/1/0434/9886/4804/files/94247838209.pdf
    • https://cdn.shopify.com/s/files/1/0434/2880/6807/files/armonicos_en_la_red_electrica.pdf
    • https://cdn.shopify.com/s/files/1/0431/1682/2692/files/15690789284.pdf
    • https://cdn.shopify.com/s/files/1/0432/2328/5920/files/19390514373.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e1f.bin
858f5ca1872513d6f28f8457bc204e2907ab592bf312199b72f7be7c347bf5ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E1F 5420 bytes
font_01_sfnt_off00007061.bin
810b36752f3206578920330e3eb4958c4c1b57b0c69cd6f23ae9ef88c8e6f351		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7061 9956 bytes
font_02_sfnt_off0000926b.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x926B 4324 bytes

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