Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37d54e560dc0d85…

MALICIOUS

PDF

50.6 KB Created: 2020-07-30 21:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de93f575b6d994d4539a18f376577ad1 SHA-1: 0e03ec0be15161d91bf06594e64816db3e7eb05e SHA-256: f37d54e560dc0d8501707874b6e1a8984686b66e1123ac2da5e370ede00f9f6f
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain metadata related to academic topics, likely serving as a lure.

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=binomial+distribution+and+normal+distribution+pdf
    • http://files.sjdictionarysources.org/uploads/1/3/1/3/131384604/4335969.pdf
    • http://files.silverstatesmenbarbershopchorus.com/uploads/1/3/1/8/131871816/gawemakoxiretov_bazam_pigadigunom_luluvepojil.pdf
    • http://files.fanatixwrestlingfederation.com/uploads/1/3/2/8/132814050/5074625.pdf
    • http://files.decaledinc.com/uploads/1/3/1/6/131606011/zufujidiruwafuzab.pdf
    • https://cdn.shopify.com/s/files/1/0429/1887/1207/files/99141182017.pdf
    • https://cdn.shopify.com/s/files/1/0431/5398/1589/files/93340217261.pdf
    • https://cdn.shopify.com/s/files/1/0428/8197/4435/files/10597568156.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/12711677584.pdf
    • https://cdn.shopify.com/s/files/1/0437/3685/8773/files/86896018486.pdf
    • https://cdn.shopify.com/s/files/1/0435/5332/5219/files/13135998197.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8184/files/56233083901.pdf
    • https://cdn.shopify.com/s/files/1/0432/1889/5010/files/sixeranujonavefezemewoz.pdf
    • https://cdn.shopify.com/s/files/1/0438/3378/6530/files/83666930174.pdf
    • https://cdn.shopify.com/s/files/1/0430/5666/0633/files/96657544762.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2084/files/dixikivunogemumow.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zofoxi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4158/6332/files/22118660677.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40133843423.pdf
    • https://cdn.shopify.com/s/files/1/0435/0902/2886/files/degivijawubobol.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_off00007fbd.bin
1510daf974aa365fa995089b3a9a315d4a01294bfd12f90d768c1235c6bce972		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FBD 5140 bytes
font_01_sfnt_off00009100.bin
03d39b3286039d5603332129a80a3091ec871a2644afc9a17492d7619c137e7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9100 13840 bytes

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