Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb195e313ce7c537…

MALICIOUS

PDF

43.8 KB Created: 2020-08-17 14:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a7efc3ccb533d188c45efee0a085a0e SHA-1: e01ff5944f4e2e3862b4a3ac243c68b00f779211 SHA-256: cb195e313ce7c537d2662168fae62995e482e22dc65c921b4046003b91665325
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.cc'. The document body, though partially corrupted, contains text related to a 'Roman numerals 1 to 12 worksheet' and includes the malicious URL. This suggests a social engineering lure to trick users into clicking the link, which then redirects to potentially malicious content. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy, likely for SEO manipulation or to obscure the final malicious destination.

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=roman+numerals+1+to+12+worksheet
    • http://files.png1960.org/uploads/1/3/1/6/131636914/2492947.pdf
    • http://nomazino.hbdixon.com/uploads/1/3/2/7/132712116/riweralufoletaki.pdf
    • http://tadifo.ginostrattoria.com/uploads/1/3/0/7/130738956/ruvidesinodaf_nerokedoxedati_maronereverepav_ribov.pdf
    • https://cdn.shopify.com/s/files/1/0438/1537/0912/files/94314075635.pdf
    • https://cdn.shopify.com/s/files/1/0435/9330/2178/files/85157718524.pdf
    • https://cdn.shopify.com/s/files/1/0453/8466/3208/files/xubefuwureba.pdf
    • https://cdn.shopify.com/s/files/1/0436/1093/1358/files/algebra_1_graphing_equations_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0427/4972/2790/files/56539445864.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28821374719.pdf
    • https://cdn.shopify.com/s/files/1/0444/8894/9927/files/insertion_sort_pseudocode.pdf
    • https://cdn.shopify.com/s/files/1/0434/5587/3190/files/96932864081.pdf
    • https://cdn.shopify.com/s/files/1/0452/4074/6145/files/ecological_importance_of_bryophytes.pdf
    • https://cdn.shopify.com/s/files/1/0432/7217/5781/files/96974403920.pdf
    • https://cdn.shopify.com/s/files/1/0429/7100/5082/files/atari_breakout_trick.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_off00006024.bin
2b3e378b5cb068dac9ee3d245f348c4aade71d21b0e164d4c2226c125cb39a33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6024 5108 bytes
font_01_sfnt_off00007167.bin
e8682180dd21f965203569666758888608ec14f2bdf9646fc4d694c595f6bb2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7167 10192 bytes
font_02_sfnt_off0000944d.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x944D 4324 bytes

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