Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3e12510821b7d8…

MALICIOUS

PDF

45.3 KB Created: 2020-08-09 14:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f75b54820323023c8d8d5359ce739ee9 SHA-1: a5a8cda2b99bd7156d36a5b388c19925959f8ac3 SHA-256: 8b3e12510821b7d80984f246b633fc8bdd5b6d0a4af9476aac13f49bdbe2e4ea
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a link to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a lure for a specific PDF download. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm designed to attract search engine traffic and potentially distribute malicious content.

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=allahabad+high+court+aro+paper+pdf+download
    • http://kogowuxo.oliviacliftonbligh.com/uploads/1/3/2/8/132814930/satenojov-sofigo-rivavu.pdf
    • http://files.colemansmoll.com/uploads/1/3/2/8/132815008/firitumemekibule.pdf
    • http://kizozujav.plant-miner.com/uploads/1/3/1/4/131453870/ruzapux.pdf
    • http://files.hollywoodlandpod.com/uploads/1/3/1/3/131398143/de2c65b29d1e69.pdf
    • http://files.wvcls.org/uploads/1/3/0/7/130738921/c44847fc84f711.pdf
    • https://cdn.shopify.com/s/files/1/0428/5025/5014/files/xuminevoledosamejorinuroj.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9462/files/sajetirajiruzefuxupi.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4749/files/32438807219.pdf
    • https://cdn.shopify.com/s/files/1/0435/1311/8872/files/zojivebuj.pdf
    • https://cdn.shopify.com/s/files/1/0435/2265/4362/files/77146994460.pdf
    • https://cdn.shopify.com/s/files/1/0431/3848/2332/files/monster_manual_3_3._5.pdf
    • https://cdn.shopify.com/s/files/1/0433/6776/0028/files/management_of_gestational_diabetes_mellitus.pdf
    • https://cdn.shopify.com/s/files/1/0427/4988/6620/files/jegonus.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7318/files/mosasidiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/xinput_compatible_hid_device.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_off00005dcb.bin
f91ba26c459c42daff64f5785a00463daf76f60a5d3ab18063151958737621ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DCB 5460 bytes
font_01_sfnt_off00007068.bin
cad22eb7599f9c80a77e396d62aef24aefb74bcd2ec27bc75233995a07f8a0cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7068 10092 bytes
font_02_sfnt_off00009330.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9330 16092 bytes

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