Malicious PDF — malware analysis report

Static analysis result for SHA-256 4384ffe417352937…

MALICIOUS

PDF

40.8 KB Created: 2020-08-24 02:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16c74e9a9dcf8cc18a9feaf2f8691707 SHA-1: a4ef2a6bae9f4e78c7af9085af809273d272d813 SHA-256: 4384ffe41735293760ce3a5803f34e303410fbfd27a335d65dd01140cc3c8003
152 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with one identified as a malicious redirector pointing to 'https://ttraff.cc/pify?keyword=loan+amortization+excel++free'. The presence of a large number of external PDF links hosted on domains like cdn.shopify.com suggests a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness.

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=loan+amortization+excel++free
    • http://files.autobodyassociation.org/uploads/1/3/0/7/130775245/fenovi_jijomidul.pdf
    • http://laben.lcaclassicalhistory.com/uploads/1/3/2/8/132814930/8d7d5.pdf
    • http://gabunomu.norrisavenuembc.com/uploads/1/3/1/6/131606262/zawiwe-zigawab-ramefewajanodos.pdf
    • https://cdn.shopify.com/s/files/1/0437/0753/1432/files/4675664152.pdf
    • https://cdn.shopify.com/s/files/1/0434/0973/5845/files/zadabejejijazune.pdf
    • https://cdn.shopify.com/s/files/1/0431/6758/0322/files/radonitadorupivokija.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1674/files/43710394396.pdf
    • https://cdn.shopify.com/s/files/1/0429/2250/8447/files/53598888731.pdf
    • https://cdn.shopify.com/s/files/1/0430/9732/5732/files/13553652595.pdf
    • https://cdn.shopify.com/s/files/1/0431/4333/2000/files/98150629565.pdf
    • https://cdn.shopify.com/s/files/1/0434/3113/3340/files/3132170451.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2452/files/closer_ne_yo_sheet_music.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_off0000624b.bin
1d45655710d13781a1e92116fd68e78831c5b59909a527865dbdf1f35d0707a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x624B 4908 bytes
font_01_sfnt_off000072f5.bin
e220ba960f1638f230947c662eb36fb5d528563a0423f809fb64591adc09c4af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F5 10588 bytes

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