Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb09b079ac0d972…

MALICIOUS

PDF

44.5 KB Created: 2020-08-14 07:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaad46a1e778c5ae83cac0eeed63b2c8 SHA-1: 9165fc54af45ce8d020d2cfdc9bd8cfd73bd9dc4 SHA-256: dfb09b079ac0d9720e9f8871c6ab6458689676a434f97d70d4f1912dd9aad752
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is further supported by the ML classifier's high confidence score. The document body, though partially corrupted, contains text related to 'factors and multiples worksheets grade 6' and includes the malicious URL. This suggests a social engineering lure to trick users into clicking the link, likely leading to further malicious content. The presence of a link farm heuristic indicates a broader distribution strategy.

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=factors+and+multiples+worksheets+grade+6
    • http://tesabesot.sassypineappleshop.com/uploads/1/3/1/3/131383482/zosasewukepi.pdf
    • http://rufuranav.philmancusi.com/uploads/1/3/2/7/132710714/degotuvi.pdf
    • http://files.genotac.com/uploads/1/3/2/6/132682861/6812918.pdf
    • https://cdn.shopify.com/s/files/1/0432/5025/3979/files/66514671911.pdf
    • https://cdn.shopify.com/s/files/1/0433/1097/3083/files/sebaj.pdf
    • https://cdn.shopify.com/s/files/1/0438/7209/2315/files/facebook_for_nokia_e63_symbian.pdf
    • https://cdn.shopify.com/s/files/1/0433/4537/9478/files/2916008018.pdf
    • https://cdn.shopify.com/s/files/1/0428/9308/2783/files/xabewunowajifuv.pdf
    • https://cdn.shopify.com/s/files/1/0435/7649/2195/files/factory_design_pattern_java.pdf
    • https://cdn.shopify.com/s/files/1/0427/8750/4294/files/norodevadojipabujexup.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7618/files/tevan.pdf
    • https://cdn.shopify.com/s/files/1/0428/9911/2095/files/kudepigoxegefikapadef.pdf
    • https://cdn.shopify.com/s/files/1/0437/6405/6225/files/wunulotakiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/6587/6379/files/sewosozigufimeturoki.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_off0000616a.bin
b977f44eb59675d6a42337e07f795338f6405df309ffc264748da21dd6a70413		 pdf-font-stream PDF embedded font (sfnt) at offset 0x616A 5636 bytes
font_01_sfnt_off00007474.bin
4c9273aaa3700cf3bd866ae5d410a4a91e39e39fc254c0ad20f33cf62a079375		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7474 10132 bytes
font_02_sfnt_off0000972b.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x972B 4324 bytes

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