Malicious PDF — malware analysis report

Static analysis result for SHA-256 11cd5b8ec015cb1a…

MALICIOUS

PDF

39.4 KB Created: 2020-08-20 13:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4883f692bb9c36ffc2a644780695f457 SHA-1: e2a334d212b9d03a630a9c97948efbdd3cf89ec6 SHA-256: 11cd5b8ec015cb1a0229fbc22c68c24c1e02dd1e8ad16151eea6f8a921d73ee2
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one to a known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=area+of+parallelogram+and+triangle+worksheet'. The document body, though heavily obfuscated, appears to be related to an educational worksheet, suggesting a lure. The presence of multiple external PDF links, some pointing to potentially generated URLs, indicates a link farm strategy to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.com/pify?keyword=area+of+parallelogram+and+triangle+worksheet
    • http://files.asia-days.com/uploads/1/3/0/7/130776775/wirurak_polovuwakadiner_fabemopofo_bozoxu.pdf
    • http://files.minnewaskawarmup.org/uploads/1/3/1/6/131606789/4408093.pdf
    • http://files.roothousemuseum.com/uploads/1/3/0/7/130739850/75fa388cf3d3028.pdf
    • http://files.saintpaulcatholicchurchpocahontas.com/uploads/1/3/2/7/132740865/9848483.pdf
    • http://wawegik.tracylarkindesign.com/uploads/1/3/0/8/130873851/gowebufali.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/7281/3211/files/41564219930.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/87748514175.pdf
    • https://cdn.shopify.com/s/files/1/0433/3443/4969/files/79414436690.pdf
    • https://cdn.shopify.com/s/files/1/0440/0722/7542/files/17559204168.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vofelowuloluvazoriwonub.pdf
    • https://cdn.shopify.com/s/files/1/0432/7663/2220/files/darigunetoti.pdf
    • https://cdn.shopify.com/s/files/1/0432/2253/2251/files/76526530143.pdf
    • https://cdn.shopify.com/s/files/1/0430/8523/4338/files/somitijemopi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9679/3503/files/793918870.pdf
    • https://cdn.shopify.com/s/files/1/0429/0812/3303/files/49846873983.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8167/files/81889907938.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bd7.bin
878ed7d83a26c28b66644f4891b67bc55c4431d0bf76cde76af7eadf458d1251		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD7 5600 bytes
font_01_sfnt_off00006eca.bin
039cbdb1bbdf5f1f8b72fae59e0d373b3f14ba839a481627278d6ba2d26e636f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ECA 9892 bytes

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