Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce178ce6a420ce06…

MALICIOUS

PDF

53.2 KB Created: 2020-08-06 19:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ac70521e52fc6087cc46a7ecd48b7ca SHA-1: f504a73d67cf0cea225928a8a49a4411d4add733 SHA-256: ce178ce6a420ce062ef46795120a69ba5e76a11b8eb3f2a25384c3b1fab56173
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=aarti+sangrah+pdf+file+download'. This indicates the document's primary purpose is to redirect users to potentially malicious content. The presence of a large number of external PDF links, many hosted on Shopify, further suggests a link farm or SEO manipulation tactic to drive traffic to the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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=aarti+sangrah+pdf+file+download
    • http://files.stealthbuckets.com/uploads/1/3/2/8/132815882/2602108.pdf
    • http://wawenu.benfaler.com/uploads/1/3/2/7/132710703/5043219.pdf
    • http://gedazuto.asterfertilityclinic.com/uploads/1/3/2/6/132681579/bojuzirimujoxarenow.pdf
    • http://files.jaegercounseling.com/uploads/1/3/1/4/131406372/lurodarare_wiliganadi.pdf
    • https://cdn.shopify.com/s/files/1/0435/3871/0696/files/26305196656.pdf
    • https://cdn.shopify.com/s/files/1/0428/4288/2215/files/pozijejon.pdf
    • https://cdn.shopify.com/s/files/1/0430/6563/9069/files/wevis.pdf
    • https://cdn.shopify.com/s/files/1/0437/7939/1637/files/75921499064.pdf
    • https://cdn.shopify.com/s/files/1/0432/1142/3902/files/kojigafariwuxifad.pdf
    • https://cdn.shopify.com/s/files/1/0427/9091/2159/files/68570386606.pdf
    • https://cdn.shopify.com/s/files/1/0431/0233/9232/files/xenor.pdf
    • https://cdn.shopify.com/s/files/1/0438/6629/2389/files/83779421286.pdf
    • https://cdn.shopify.com/s/files/1/0440/7423/8102/files/wobezevil.pdf
    • https://cdn.shopify.com/s/files/1/0433/9099/2549/files/47315574806.pdf
    • https://cdn.shopify.com/s/files/1/0435/2026/2308/files/zumaweko.pdf
    • https://cdn.shopify.com/s/files/1/0439/7016/6942/files/xugujirajokijukimuloxos.pdf
    • https://cdn.shopify.com/s/files/1/0432/3845/7508/files/27133699327.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/99734760109.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/
    • https://cdn.shopify.com/s/files/1/0435/2026/230

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b6b.bin
07cb705247330403a73bb96535471cf1a43b8c074e30da7f3ca6535fea8314db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B6B 5172 bytes
font_01_sfnt_off00008d05.bin
5d923da32a4265ab2736a19687e429321db12c39ef60b6dd40c1a8d86cd68626		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D05 14500 bytes
font_02_sfnt_off0000b9b4.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B4 4324 bytes

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