Malicious PDF — malware analysis report

Static analysis result for SHA-256 989a19458aa2b104…

MALICIOUS

PDF

40.3 KB Created: 2020-08-25 00:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 148a5ce5f0b6de56215253135025a7c5 SHA-1: 21d1c1bc2292a9cc72c591127664b17ea71c33c6 SHA-256: 989a19458aa2b104c69f699e8ede4975e45facd55df64910d31ff01225c9aef0
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a link to a known malicious redirector service. It also features a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or a method to disguise malicious destinations. The presence of the redirector URL indicates an attempt to obscure the true nature of the attack, likely leading to phishing or malware distribution.

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=avg+free+windows+xp+32+bit
    • http://demul.forgecraftsteelfabricators.co.uk/uploads/1/3/1/4/131483152/natutipa.pdf
    • http://files.centraleastwoodrugby.com/uploads/1/3/0/7/130776485/0237a15ab.pdf
    • http://files.stuartpeterman.com/uploads/1/3/1/6/131606434/84ea15892.pdf
    • https://cdn.shopify.com/s/files/1/0435/6397/4805/files/mandatory_reporting_act_victoria.pdf
    • https://cdn.shopify.com/s/files/1/0437/3518/7605/files/letter_of_recommendation_template_for_medical_student.pdf
    • https://cdn.shopify.com/s/files/1/0431/6174/7620/files/ralumenirare.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7342/files/4407564542.pdf
    • https://cdn.shopify.com/s/files/1/0431/0496/0661/files/date_format_in_uae.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16711599054.pdf
    • https://cdn.shopify.com/s/files/1/0430/9005/1221/files/development_economics_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/1128/4893/files/66359417040.pdf
    • https://cdn.shopify.com/s/files/1/0438/6455/5680/files/98964180578.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5522/files/xazolumezesonoxi.pdf
    • https://cdn.shopify.com/s/files/1/0440/6748/7894/files/god_of_wonders_chords.pdf
    • https://cdn.shopify.com/s/files/1/0433/4895/1194/files/dagobunafumorufes.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_off00005824.bin
23c25368696b9f84e43d60a03d4bfa2d8bac922f2d0ef43ad7613bb5b0391171
pdf-font-stream PDF embedded font (sfnt) at offset 0x5824 5612 bytes
font_01_sfnt_off00006b6e.bin
9f175a03514641707f034e003db280fc7a8bdd352b9b4b287ffa741155a09446
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B6E 12204 bytes