Malicious PDF — malware analysis report

Static analysis result for SHA-256 54335b295b0ab89d…

MALICIOUS

PDF

43.7 KB Created: 2020-07-31 19:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b36a3c6bb9f3351d17f17c7dba0c949 SHA-1: 9f17dcae3dc37051239644a15bb5ea3d804093eb SHA-256: 54335b295b0ab89df585695fc7476125ab9a5616eea85c85b0978942c656bd70
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one prominent link redirecting to malicious infrastructure. The document body, though partially corrupted, contains text related to a 'Kenmore 70 series dryer manual pdf' and the wkhtmltopdf application, suggesting a lure to disguise the malicious link. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further 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.cc/pify?keyword=kenmore+70+series+dryer+manual+pdf
    • http://files.sshvug.com/uploads/1/3/1/4/131438583/xobitukokuliw.pdf
    • http://files.classyandsassyvintagejewelry.com/uploads/1/3/2/7/132740723/690220.pdf
    • http://files.winneconnethriftgift.org/uploads/1/3/1/4/131438163/6539277.pdf
    • http://files.jqacademy.org/uploads/1/3/1/8/131872087/vaguwonul.pdf
    • https://cdn.shopify.com/s/files/1/0428/2915/2423/files/solawe.pdf
    • https://cdn.shopify.com/s/files/1/0429/9273/0275/files/87715411233.pdf
    • https://cdn.shopify.com/s/files/1/0434/7383/0048/files/rujalogogafabepanokib.pdf
    • https://cdn.shopify.com/s/files/1/0428/4183/3635/files/9226837502.pdf
    • https://cdn.shopify.com/s/files/1/0429/2830/8387/files/41654105318.pdf
    • https://cdn.shopify.com/s/files/1/0430/3981/7890/files/55531936777.pdf
    • https://cdn.shopify.com/s/files/1/0436/8800/1689/files/88084348597.pdf
    • https://cdn.shopify.com/s/files/1/0428/9812/9062/files/rusamupel.pdf
    • https://cdn.shopify.com/s/files/1/0438/6075/4582/files/ranelifavusojefapogobafij.pdf
    • https://cdn.shopify.com/s/files/1/0432/8911/6836/files/93024896082.pdf
    • https://cdn.shopify.com/s/files/1/0430/6645/8265/files/gomotemajopodimifenamut.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/78671980072.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_off00006a85.bin
807f0d24aa6a8e9a3f39a85151b8a852b121adfb31ab78d502d1f5291b648bbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A85 5480 bytes
font_01_sfnt_off00007d25.bin
e6e3783ac84ea0eefbbb3782c8dbd34146745839de3dd115a6f04919f6def484
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D25 10808 bytes