Malicious PDF — malware analysis report

Static analysis result for SHA-256 a151cc70667f040f…

MALICIOUS

PDF

67.1 KB Created: 2020-08-14 15:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e68946e235510a341a15f88bb4167203 SHA-1: 53b5bd4b3906d8594e34a8461c2b79c2ae3fcca7 SHA-256: a151cc70667f040f2d6484e1b229c9a7d6b1cdeb23741aa35cc54cf2c99dbb90
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=abdomen+agudo+pdf+2019'. Additionally, it exhibits a PDF link farm heuristic, indicating a large number of external links, with 'https://cdn.shopify.com/s/files/1/0428/4717/4812/files/gikitego.pdf' being one of the first identified. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirect URL, reinforcing the malicious intent.

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=abdomen+agudo+pdf+2019
    • http://files.villagestwo.com/uploads/1/3/2/7/132740462/0163c.pdf
    • http://delipobi.ron-warren.com/uploads/1/3/0/8/130873715/jelirasubokoz_likebakuvefoso_tiwivami_totug.pdf
    • http://lijavi.kaylacrance.com/uploads/1/3/0/8/130874493/5964373.pdf
    • http://mifej.internationalhrnetwork.org/uploads/1/3/1/4/131437421/bosuvova.pdf
    • http://files.psuperformingartscouncil.com/uploads/1/3/1/6/131636890/zemabupexuzimif.pdf
    • https://cdn.shopify.com/s/files/1/0428/4717/4812/files/gikitego.pdf
    • https://cdn.shopify.com/s/files/1/0430/9155/8551/files/49618661404.pdf
    • https://cdn.shopify.com/s/files/1/0437/5255/4657/files/noratibazog.pdf
    • https://cdn.shopify.com/s/files/1/0438/9906/0392/files/wubilotel.pdf
    • https://cdn.shopify.com/s/files/1/0430/3483/7149/files/lowes_radford_va.pdf
    • https://cdn.shopify.com/s/files/1/0434/2179/4460/files/velajip.pdf
    • https://cdn.shopify.com/s/files/1/0428/4314/4355/files/27591858106.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dedijadexurusefux.pdf
    • https://cdn.shopify.com/s/files/1/0436/2344/8736/files/nogeg.pdf
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/20908979285.pdf
    • https://cdn.shopify.com/s/files/1/0434/6268/8918/files/sociology_a_level_textbook_ocr.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_off0000c8e7.bin
6337ad475661531c4ce155f811b16589fb0fbcef8606811895db483d959ae1dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E7 5664 bytes
font_01_sfnt_off0000dc26.bin
5d35a2b71fabca6940fd75be2e071b690a3f1b53417a847f852ef5848d3c6cd9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC26 10376 bytes