Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f3a6a3be8478e1…

MALICIOUS

PDF

46.7 KB Created: 2020-08-21 14:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e1a4e8704c0a71a794f482aec625db4 SHA-1: f1b4ad4a05a9ec2f3914bf97fe10532fe656a548 SHA-256: 48f3a6a3be8478e11bcaeeb364d8ce57ab3614ac663c9bcf48ea361a7674ce0d
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that is disguised as a Kindle app download for Windows 10. This link leads to a known malicious redirector infrastructure. The document also contains a large number of embedded links, many of which point to Shopify domains, suggesting a link farm or SEO manipulation tactic to distribute the malicious URL.

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=kindle+app+for+laptop+windows+10
    • http://files.mandalatreasures.net/uploads/1/3/1/3/131384636/3531508.pdf
    • http://files.elizabethlewis.com/uploads/1/3/0/7/130776167/putexobizule.pdf
    • http://files.letohub.com/uploads/1/3/0/7/130776591/kozokufafekezuwo.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/pexipilobipir.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dedagefegumam.pdf
    • https://cdn.shopify.com/s/files/1/0429/5062/3385/files/zituwovujamubarogujawuz.pdf
    • https://cdn.shopify.com/s/files/1/0440/5939/4213/files/76815962122.pdf
    • https://cdn.shopify.com/s/files/1/0432/4818/9603/files/zumilu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7291/files/kioti_service_manual_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/3885/1751/files/wrong_turn_7_movie_hd.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3762/files/front_end_developer_remote_jobs.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3796/files/tasobevudosiroperedifiku.pdf
    • https://cdn.shopify.com/s/files/1/0431/0981/0343/files/gutopanevotupukarubipin.pdf
    • https://cdn.shopify.com/s/files/1/0435/7203/5739/files/libros_de_aperturas_de_ajedrez_gratis.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_off0000786e.bin
d05bb8addc97f5785d631f63bfd1ca371bbe8a92330f71453663fa6ed531ba46
pdf-font-stream PDF embedded font (sfnt) at offset 0x786E 5292 bytes
font_01_sfnt_off00008a8e.bin
e0b57e26353d8e58cfc12ed78ddc6847e7404edb4431f2cf229b6e65505bc3c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A8E 10444 bytes