Malicious PDF — malware analysis report

Static analysis result for SHA-256 e48ea1226c4ca8db…

MALICIOUS

PDF

34.7 KB Created: 2020-08-08 23:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13212f45b896efef8f5a1dca751d1e9b SHA-1: ad8adc8098fe78a90c01c8581c0e8b48bc54654e SHA-256: e48ea1226c4ca8dbd50f16adec04e7faf11f4aa61fa44340637dc75858655ac9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains numerous embedded links, many of which point to domains associated with link farms and redirectors. The primary malicious link, https://ttraff.com/pify?keyword=academic+calendar+2020+ssa+assam+pdf+download, is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting the intent is to lure the user into clicking the link. The ML classifier strongly supports the malicious nature of this PDF.

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=academic+calendar+2020+ssa+assam+pdf+download
    • http://seduwibum.lovolutionofkindness.com/uploads/1/3/1/3/131379246/5a8c561878.pdf
    • http://files.debbiemayer.com/uploads/1/3/0/7/130776483/4874221.pdf
    • http://files.babeswithbabesfitness.com/uploads/1/3/0/9/130969751/3b54564bb0555a0.pdf
    • http://kesetidi.lifeofgraydon.com/uploads/1/3/1/4/131453541/bonomuvusi.pdf
    • http://files.lakeidamn.org/uploads/1/3/0/9/130969568/f6153692.pdf
    • https://cdn.shopify.com/s/files/1/0431/1983/7345/files/ketemem.pdf
    • https://cdn.shopify.com/s/files/1/0428/0687/0183/files/5892268496.pdf
    • https://cdn.shopify.com/s/files/1/0429/5000/0796/files/ct_dmv_address_change.pdf
    • https://cdn.shopify.com/s/files/1/0428/4776/4636/files/tuwudejoxe.pdf
    • https://cdn.shopify.com/s/files/1/0430/6052/7265/files/exercices_sur_l_article_partitif.pdf
    • https://cdn.shopify.com/s/files/1/0433/2063/9646/files/xesite.pdf
    • https://cdn.shopify.com/s/files/1/0431/1128/4893/files/pexasuxo.pdf
    • https://cdn.shopify.com/s/files/1/0437/2201/4870/files/occipital_lobe_function_tests.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25696514874.pdf
    • https://cdn.shopify.com/s/files/1/0432/7338/8190/files/27604968301.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/18981980774.pdf
    • https://cdn.shopify.com/s/files/1/0436/8980/3941/files/boule_de_suif_texte.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_off000048c0.bin
072b9f078066bb1b497ce36eb56840d71321fd669724eefb544eb3505baad1b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48C0 5656 bytes
font_01_sfnt_off00005bf6.bin
ba4c4c7623b375134f01abb873b6722b2b87e855454c78c909b0a7807083f0a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF6 10068 bytes

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