Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50113adb620a253…

MALICIOUS

PDF

44.1 KB Created: 2020-07-31 02:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccf8d397a7eb78ca63e76aa472ed2367 SHA-1: 93a699e30689ad2b75b83696538b92448632b0d6 SHA-256: a50113adb620a253191987128d0d752b0c76c11d7f81fdb5f93e786f2fe08240
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to downloading 'Corel draw x5 tutorial pdf free download', suggesting a lure for users seeking software. The presence of a malicious redirector link indicates an attempt to lead the user to a harmful destination. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=corel+draw+x5+tutorial+pdf+free+download
    • http://files.benabbydesignsco.com/uploads/1/3/1/0/131071037/dukibov-nilipuniku-lubexaduker-badafenekedomud.pdf
    • http://files.zacharysasim.com/uploads/1/3/1/0/131070207/3011665.pdf
    • http://files.peaceloveandhairsalon.com/uploads/1/3/1/8/131871909/3927389.pdf
    • http://files.peaceloveandhairsalon.com/uploads/1/3/1/8/131871909/3
    • https://cdn.shopify.com/s/files/1/0434/6681/7689/files/28985855937.pdf
    • https://cdn.shopify.com/s/files/1/0436/0008/5160/files/8769497521.pdf
    • https://cdn.shopify.com/s/files/1/0431/7334/7488/files/towimulanipu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2890/5127/files/97865655109.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/zikabetukep.pdf
    • https://cdn.shopify.com/s/files/1/0433/4505/1797/files/ditiwivapesexa.pdf
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/5918725722.pdf
    • https://cdn.shopify.com/s/files/1/0435/5594/6655/files/37932430268.pdf
    • https://cdn.shopify.com/s/files/1/0430/2998/7489/files/sakeno.pdf
    • https://cdn.shopify.com/s/files/1/0428/9894/8255/files/17414525248.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_off00006e93.bin
ecc4e6324f1678d40cfa6ed0f34934260d2b73a13fe701bc02031aa2a2421a52
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E93 5048 bytes
font_01_sfnt_off00007ff1.bin
d6bd5480cb612a97b1925c4c48a058cf922ee9dae39bf9f855278bf8a2375be4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF1 10220 bytes