Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f668afa6f937683…

MALICIOUS

PDF

37.7 KB Created: 2020-08-07 09:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: daf0199522f471ab48cdc9ec871e82e3 SHA-1: e84a9183a234e9b754822459a349ba6341ee0a6f SHA-256: 1f668afa6f9376833faed7cc8fcd7676827933b79e17867968a558d106378461
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The primary malicious URL is https://ttraff.ru/pify?keyword=bhagavad+gita+slokas+in+telugu+with+meaning+pdf. The document body, though heavily obfuscated, also contains this URL, reinforcing the lure. The ML classifier strongly supports the malicious verdict.

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.ru/pify?keyword=bhagavad+gita+slokas+in+telugu+with+meaning+pdf
    • http://files.startup.exchange/uploads/1/3/2/8/132814024/nurufotuwowemefifol.pdf
    • http://files.divinelighthealers.net/uploads/1/3/1/3/131381919/kixudo.pdf
    • http://ravovaxip.mabellepresent.com/uploads/1/3/0/8/130874655/jaxewofoli.pdf
    • http://farug.kcpym.org/uploads/1/3/2/6/132696021/ffe9ada6.pdf
    • http://files.angelabain.com/uploads/1/3/1/3/131384573/dixorexanuxaji_pojoxenuduvi.pdf
    • https://cdn.shopify.com/s/files/1/0436/0480/3746/files/20613472660.pdf
    • https://cdn.shopify.com/s/files/1/0429/6055/2085/files/72947264248.pdf
    • https://cdn.shopify.com/s/files/1/0433/3505/7559/files/english_vocabulary_with_bangla_meaning_for_ielts.pdf
    • https://cdn.shopify.com/s/files/1/0436/7430/4662/files/73788476851.pdf
    • https://cdn.shopify.com/s/files/1/0435/2540/6874/files/39040777712.pdf
    • https://cdn.shopify.com/s/files/1/0433/4462/5822/files/60660634019.pdf
    • https://cdn.shopify.com/s/files/1/0434/3106/7813/files/85504929688.pdf
    • https://cdn.shopify.com/s/files/1/0431/8255/5297/files/lithium_ion_polymer_battery.pdf
    • https://cdn.shopify.com/s/files/1/0431/8593/0389/files/63521390412.pdf
    • https://cdn.shopify.com/s/files/1/0429/8014/7359/files/sikorewofumo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/dibupibunulefuxuxibevup.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/85483270212.pdf
    • https://cdn.shopify.com/s/files/1/0438/9984/6824/files/fundamentals_of_aquatic_toxicology.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000488a.bin
5f44573397a0ec8d0bc48a6a6e546e7953e2b00754ae9fc05e09e901862d481c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x488A 5624 bytes
font_01_sfnt_off00005ba8.bin
71b68a0306a2d0c06d4121b0b53aa7b7d11e21642841f261c4c4647443d9cc69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA8 2300 bytes
font_02_sfnt_off00006679.bin
c930c260de3c9e9804124b1943bb35050000506277b8faf94afa6becd31d58b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6679 9608 bytes

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