Malicious PDF — malware analysis report

Static analysis result for SHA-256 32fdbe707a044aea…

MALICIOUS

PDF

34.6 KB Created: 2020-08-20 23:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8999496a7aa4683005139417487d604 SHA-1: f7772642c8687be0b70d9bc325abbbb6c8750c7a SHA-256: 32fdbe707a044aea4ac782f68ecec9bc07e669cab0cfb3194f7f98a2f9b7721d
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a large number of external links, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The document body contains a URL that appears to be a lure for 'Answering service care rocky mount nc', suggesting a phishing or scam attempt. The presence of numerous Shopify-hosted links and a malicious redirector points towards an attempt to distribute further malicious content or engage in SEO-based abuse.

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=answering+service+care+rocky+mount+nc
    • http://logekiba.riverplus-multimedia.com/uploads/1/3/1/3/131382595/8ff9691f3d6.pdf
    • http://files.tamukhornstudio.com/uploads/1/3/2/6/132681294/2917717.pdf
    • http://sotemo.villaserenacabo.net/uploads/1/3/1/4/131454265/fawokufiririp-nuzusezulatimel-toxeloxuramufib.pdf
    • https://cdn.shopify.com/s/files/1/0430/0092/2261/files/4k_video_er_url.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gijamibumiji.pdf
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/18990332034.pdf
    • https://cdn.shopify.com/s/files/1/0434/5669/2390/files/space_flight_simulator_mod_apk_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0438/1474/8322/files/female_body_language_attraction.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/70051207345.pdf
    • https://cdn.shopify.com/s/files/1/0428/8882/2950/files/harvard_referencing_quick_guide_usc.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4266/files/diff_between_accuracy_and_precision.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51439980706.pdf
    • https://cdn.shopify.com/s/files/1/0436/1804/2018/files/guvefugasonokoxalutek.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/talalobomifuzelonog.pdf
    • https://cdn.shopify.com/s/files/1/0433/8201/4108/files/sample_format_of_appreciation_certificate.pdf
    • https://cdn.shopify.com/s/files/1/0432/5117/1478/files/90775520317.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_off000048b9.bin
0874f5ac4ce3592d6646873cb47b44a3adc3b0b5860365d0e6c7265bca246ffc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48B9 5396 bytes
font_01_sfnt_off00005b15.bin
c6cf8f1a2d5bdab5c28cf74f1ceda0d589563138fc0e09d0d29fe30d9c4c94fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B15 10064 bytes

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