Malicious PDF — malware analysis report

Static analysis result for SHA-256 352b18da57db2d7d…

MALICIOUS

PDF

37.9 KB Created: 2020-08-02 20:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d95f0dfcd9027d0c21c0db3a8676dc0d SHA-1: b751bfbc8cb2d10333a2e728d74c7f3eef569855 SHA-256: 352b18da57db2d7d414b6064e851c2bed5f54e8c9b43b42cedf980e198438fd6
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to known malicious infrastructure. The document body, though partially garbled, contains text suggesting it is a 'John deere s240 manual'. The primary malicious IOC is the redirector URL, which is designed to lure users to a malicious site. The PDF also contains a large number of embedded links, many pointing to Shopify domains, which is characteristic of SEO link farm tactics.

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=john+deere+s240+manual
    • http://files.chaiscope.org/uploads/1/3/0/8/130874284/1530584.pdf
    • http://files.photorinovsky.com/uploads/1/3/1/4/131406827/vogarezolarizubokula.pdf
    • http://files.spiritofthewater.org/uploads/1/3/1/4/131453432/fibotezen.pdf
    • https://cdn.shopify.com/s/files/1/0429/9092/8026/files/83718148406.pdf
    • https://cdn.shopify.com/s/files/1/0431/4952/5156/files/97070064711.pdf
    • https://cdn.shopify.com/s/files/1/0447/2055/4138/files/john_wick_1_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0936/files/63075656415.pdf
    • https://cdn.shopify.com/s/files/1/0431/6676/1120/files/xolenunimugovafutamame.pdf
    • https://cdn.shopify.com/s/files/1/0428/7276/6631/files/lipipadiwiverejato.pdf
    • https://cdn.shopify.com/s/files/1/0437/0333/7115/files/jobifogoteno.pdf
    • https://cdn.shopify.com/s/files/1/0433/4505/1797/files/wilazomerusa.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/mofimanenorifirome.pdf
    • https://cdn.shopify.com/s/files/1/0432/6300/0734/files/1489497654.pdf
    • https://cdn.shopify.com/s/files/1/0433/4573/9941/files/senadenoge.pdf
    • https://cdn.shopify.com/s/files/1/0431/8239/1451/files/kejiviserevonopemipasawuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/7409/3217/files/85878148263.pdf
    • https://cdn.shopify.com/s/files/1/0428/0582/1599/files/33490949017.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_off000049eb.bin
7262aaacb56cd9923de7f78731ade67b9db16ec0e863d0e2544fcd6e2ba81640		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49EB 5168 bytes
font_01_sfnt_off00005b3a.bin
449c62f84756e6ad9946e84ad4d3f75c4ffd6e4fb9de25715618a018458bf647		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B3A 9760 bytes
font_02_sfnt_off00007cad.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CAD 4324 bytes

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