Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d97ebed6f154126…

MALICIOUS

PDF

42.4 KB Created: 2020-08-19 19:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebe13bebc10e5f4c1ac4d314242b9ddb SHA-1: 8cc546c80e38cd8a6548ed3848573b18b7a820ba SHA-256: 9d97ebed6f154126546fa900d1b5ba15f87f64d79b05b604dc241a232a3ed9bc
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=video+compressor+android+app+free'. Another heuristic detected a large PDF link farm, with the first URL pointing to 'https://cdn.shopify.com/s/files/1/0427/5588/3175/files/pabevujagumimesavesexogi.pdf'. These findings strongly suggest a phishing or malware distribution attempt via a link farm 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.com/pify?keyword=video+compressor+android+app+free
    • http://files.sonsofitalygalileolodgekelowna.com/uploads/1/3/0/7/130776661/6008551.pdf
    • http://files.warriorweekend.net/uploads/1/3/0/7/130775528/460029.pdf
    • http://files.danielsitaly.com/uploads/1/3/0/9/130969169/lidejes.pdf
    • http://files.morethansoulfood.net/uploads/1/3/2/3/132302973/timuf.pdf
    • http://zuzavi.drainplumberpro.com/uploads/1/3/1/8/131856462/9087475.pdf
    • https://cdn.shopify.com/s/files/1/0427/5588/3175/files/pabevujagumimesavesexogi.pdf
    • https://cdn.shopify.com/s/files/1/0438/5207/1074/files/proteins_structure_and_function_david_whitford_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/8954/9729/files/brother_mfc7420_drivers.pdf
    • https://cdn.shopify.com/s/files/1/0434/1124/3162/files/26218522386.pdf
    • https://cdn.shopify.com/s/files/1/0431/9870/9918/files/wadexebugimijegidasum.pdf
    • https://cdn.shopify.com/s/files/1/0450/2857/3334/files/android_versions_statistics.pdf
    • https://cdn.shopify.com/s/files/1/0434/3480/3352/files/kapukonub.pdf
    • https://cdn.shopify.com/s/files/1/0428/4094/8892/files/58648270877.pdf
    • https://cdn.shopify.com/s/files/1/0433/0258/4480/files/modern_calligraphy_fonts.pdf
    • https://cdn.shopify.com/s/files/1/0437/3898/8709/files/debivufapawepabitixog.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_off000067ce.bin
c195623f40f89486c1d15cb0d9a613d710f21b863fb407b49f74a4d9476adefa
pdf-font-stream PDF embedded font (sfnt) at offset 0x67CE 5236 bytes
font_01_sfnt_off00007983.bin
56cd97ec9f9ca07e12798d5098765dfe88155e26c5f005511990d26fecd73332
pdf-font-stream PDF embedded font (sfnt) at offset 0x7983 10212 bytes