Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64ed04273b35fef…

MALICIOUS

PDF

45.4 KB Created: 2020-09-04 19:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5f9559f722877b42232f9d09a8d9ec4 SHA-1: 48c52f05626303c4178dbf273f3504055275e30e SHA-256: c64ed04273b35fef737c1d239da83f79fa540ce375f124792b68e29f623a93b1
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits a PDF link farm, with numerous external links, many hosted on cdn.shopify.com. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a phishing or malware delivery site. The document body contains garbled text but includes the malicious URL and several benign-looking PDF links.

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.link/wix?keyword=python+string+format+two+variables
    • https://cdn.shopify.com/s/files/1/0434/6393/4105/files/six_caps_font.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27392185694.pdf
    • https://cdn.shopify.com/s/files/1/0429/5399/8487/files/13104439855.pdf
    • https://cdn.shopify.com/s/files/1/0461/3390/3528/files/teemo_build_guide.pdf
    • https://cdn.shopify.com/s/files/1/0438/7287/8747/files/descargar_talones_fone.pdf
    • https://cdn.shopify.com/s/files/1/0432/7977/7952/files/pubinomux.pdf
    • https://cdn.shopify.com/s/files/1/0441/3181/1480/files/nokebil.pdf
    • https://cdn.shopify.com/s/files/1/0432/8875/6374/files/wuponutebawowiro.pdf
    • https://cdn.shopify.com/s/files/1/0431/6410/6908/files/cherry_bomb_le_gayi_song.pdf
    • https://cdn.shopify.com/s/files/1/0428/8207/2743/files/xituralawebikabapoxezoxaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/8958/2487/files/filled_with_determination.pdf
    • https://static.usrfiles.com/ugd/7c30af_b8103c9269f7460cbddc7c06477b786b.pdf
    • https://static.usrfiles.com/ugd/b90ba1_643f66bc1613440f979696bcc3dc5eae.pdf
    • https://static.usrfiles.com/ugd/078c79_206ac44d9b294022856c4aec9ce5b39d.pdf
    • https://static.usrfiles.com/ugd/efb3f0_fd4d2a932c24487d8f4e4bb452f1b0d3.pdf
    • https://static.usrfiles.com/ugd/96bf9d_e50a008d1b3d4392bb4f75bf54d15ca9.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_off00006155.bin
f725bf4e7e10f1e62100affe573ae13f38edc43e23eef0db6766ef54c611c055		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6155 5364 bytes
font_01_sfnt_off00007376.bin
67ff9174dfdf60b46c9f62e4c876d76257f0b1ade8a94b46e2e83b27df40ceb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7376 11536 bytes
font_02_sfnt_off00009a11.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A11 4324 bytes

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