Malicious PDF — malware analysis report

Static analysis result for SHA-256 32eec8e7cd401981…

MALICIOUS

PDF

34.0 KB Created: 2020-08-02 17:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2784b758300c4d962260c4b24b2f202d SHA-1: 21f491d1aa0a6f9a0a0b65ff731e49c2fbb955dd SHA-256: 32eec8e7cd40198106e65576fe2e96fdaeb77e8383b88024e002597b007d5b74
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. This suggests the document is designed to lure users to malicious sites. The presence of numerous links also indicates a potential SEO link farm strategy to manipulate search engine results. No scripts were extracted from this sample.

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.ru/pify?keyword=bms+season+1+episode+1
    • http://files.littlegiantsbands.org/uploads/1/3/1/3/131380623/6095352.pdf
    • http://files.mariclayton.com/uploads/1/3/1/8/131871622/7786719.pdf
    • http://files.davidmartinsstyle.com/uploads/1/3/2/6/132695306/1540514.pdf
    • https://cdn.shopify.com/s/files/1/0431/4752/6305/files/ve_a_keyboard.pdf
    • https://cdn.shopify.com/s/files/1/0433/7857/3464/files/zibebivawuwasu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6701/5329/files/mining_guide_ff14.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/fexuxipevapopufiniv.pdf
    • https://cdn.shopify.com/s/files/1/0431/3759/7591/files/61298408284.pdf
    • https://cdn.shopify.com/s/files/1/0429/8450/5498/files/78844630967.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/1999/files/38262154592.pdf
    • https://cdn.shopify.com/s/files/1/0431/3228/9178/files/97428746138.pdf
    • https://cdn.shopify.com/s/files/1/0435/8517/5713/files/27191535358.pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8541/files/photoshop_shortcut_keys.pdf
    • https://cdn.shopify.com/s/files/1/0436/2846/2233/files/subl_command_not_found_mac.pdf
    • https://cdn.shopify.com/s/files/1/0434/7602/5501/files/the_respect_principle_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/john_deere_sst16.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004973.bin
853d3b50bcabe5ba4500cdf5f6d893c512e9e1e431e55ea52ce0cd344038ee9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4973 5080 bytes
font_01_sfnt_off00005aab.bin
4c86e3ec0dd04fb97f50f218323f66fb8bb87321da7255e1e1de6172befc62df
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AAB 9632 bytes