Malicious PDF — malware analysis report

Static analysis result for SHA-256 a575edb749c04104…

MALICIOUS

PDF

41.8 KB Created: 2020-08-30 08:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3666eaa7c0f35a1a360a125e99da825 SHA-1: 0622cc6e07523864b631e23decad585832423a80 SHA-256: a575edb749c041040c0d0a5ee8e8fa512283104591aac455048917088160804a
154 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a malicious URL, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text fragments suggesting a lure for a free download. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous external links, many pointing to Shopify, suggests a link farm for SEO poisoning or traffic redirection.

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/wix?keyword=to+own+a+wolf+by+lithier+free+downlo
    • https://static.usrfiles.com/ugd/b8c837_632b364a7a88422b98969ff5ccf9022e.pdf
    • https://static.usrfiles.com/ugd/6c032c_73feff8aa3554abf8afafaa802e9e339.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f045f1f5c8348eeb9a5d24a90b7582d.pdf
    • https://static.usrfiles.com/ugd/06497e_ea0ee4d5e859434da2e3c3f0c863e462.pdf
    • https://static.usrfiles.com/ugd/238140_10d4742f61ea4535947f1827e6fdeb0f.pdf
    • https://cdn.shopify.com/s/files/1/0459/5531/7919/files/nujuxavaluvibogovezodenif.pdf
    • https://cdn.shopify.com/s/files/1/0437/8155/4325/files/understanding_statistical_process_control_wheeler.pdf
    • https://cdn.shopify.com/s/files/1/0434/2513/6792/files/lusosuxatovuje.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3458/files/jenkins_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/6998/7221/files/travail_et_energie_exercices_corrig.pdf
    • https://cdn.shopify.com/s/files/1/0429/8679/9257/files/togogozanenom.pdf
    • https://cdn.shopify.com/s/files/1/0434/0265/7957/files/tinkers_cold_blooded.pdf
    • https://cdn.shopify.com/s/files/1/0436/9353/9482/files/77910116641.pdf
    • https://cdn.shopify.com/s/files/1/0435/3861/2378/files/meteorology_today_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/1582/2747/files/sevusododejufumevalapu.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_off00006648.bin
63ca8e7411360d838a76bee770432b7ad5b5a1c3ea90bc5dc9531215c05b2a75
pdf-font-stream PDF embedded font (sfnt) at offset 0x6648 5100 bytes
font_01_sfnt_off000077a7.bin
2b68169adae4c5b8002dbd45945aa143bd5b82368238e6cce60eb92ada0ca811
pdf-font-stream PDF embedded font (sfnt) at offset 0x77A7 10200 bytes