Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1d39d166383eb5…

MALICIOUS

PDF

55.2 KB Created: 2020-08-04 23:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0879d5c53657bee20563f907efa9b435 SHA-1: 05f75eee006cd0497f5c9a91bf192e706289a30a SHA-256: aa1d39d166383eb503adfa536ed2ded3249cc090b330d93de268737534c4a751
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body text is heavily obfuscated and appears to be mostly metadata and garbled content, but it does contain the primary malicious URL. The presence of numerous links suggests a link farm or redirection strategy to obscure the ultimate destination.

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=complex+algebraic+geometry+pdf
    • http://files.christianphoto.biz/uploads/1/3/2/6/132696214/zovegusavafuteseda.pdf
    • http://gejiti.windwalkerrabbitry.net/uploads/1/3/1/3/131379894/7610819.pdf
    • http://files.pooleyslaw.co.uk/uploads/1/3/2/7/132740408/biledivalikezej-goweku.pdf
    • http://files.personalfinancialindependence.org/uploads/1/3/0/9/130969545/1164308.pdf
    • http://files.adamramey.com/uploads/1/3/1/4/131437834/jajulemefobuxufefu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2785/5522/files/34781057454.pdf
    • https://cdn.shopify.com/s/files/1/0433/7241/3079/files/bikewarekomobi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7902/5318/files/bocconi_test_ingresso.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9302/files/16514014340.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/dulupugukofanugorew.pdf
    • https://cdn.shopify.com/s/files/1/0431/1829/7245/files/dojofemeserero.pdf
    • https://cdn.shopify.com/s/files/1/0428/4832/1692/files/malogaxepitivewakirukipup.pdf
    • https://cdn.shopify.com/s/files/1/0431/4431/5029/files/69324127972.pdf
    • https://cdn.shopify.com/s/files/1/0436/0349/3022/files/24180469157.pdf
    • https://cdn.shopify.com/s/files/1/0435/1187/3688/files/59451589811.pdf
    • https://cdn.shopify.com/s/files/1/0432/4445/4051/files/77804599724.pdf
    • https://cdn.shopify.com/s/files/1/0434/4247/1064/files/46723616635.pdf
    • https://cdn.shopify.com/s/files/1/0432/9380/2646/files/97539556882.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4326/files/76684762362.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_off0000981b.bin
ae446c504aa896fd7dddd38209ba983693e570496f0e0cf70d2178cb19b0dfb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x981B 5512 bytes
font_01_sfnt_off0000aac8.bin
3327aafc6204f4959f1e43913b5845443bdde5c520a93c2635a7679586035bac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAAC8 10820 bytes

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