Malicious PDF — malware analysis report

Static analysis result for SHA-256 277deec041ab34d1…

MALICIOUS

PDF

45.9 KB Created: 2020-08-21 02:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1026d66ff18d937d92fa6c16f14bdda5 SHA-1: d5a557cec2217bd37d62f420cdb388b21b234bd7 SHA-256: 277deec041ab34d15c42d3ba4418641916f32822f40154ec2f058d5fad14925a
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDFs hosted on various domains, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=kuehne+nagel+annual+report+2009'. The document body, though partially corrupted, contains text related to 'Kuehne nagel annual report 2009', likely a lure to entice users to click the malicious link. 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.ru/pify?keyword=kuehne+nagel+annual+report+2009
    • http://files.markrheadassociates.com/uploads/1/3/0/8/130814439/6605395.pdf
    • http://files.cartravelsafety.com/uploads/1/3/0/7/130740090/kijidokofape.pdf
    • http://files.visionalliancehomes.com/uploads/1/3/1/4/131453316/dabuwejade_norimusuvosuvak_rixadiluten_kogelakumuxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9483/files/armature_deforms_body.pdf
    • https://cdn.shopify.com/s/files/1/0435/1174/2628/files/40074995514.pdf
    • https://cdn.shopify.com/s/files/1/0430/5669/3397/files/1190553937.pdf
    • https://cdn.shopify.com/s/files/1/0428/5677/5839/files/jaluxesozufigemowel.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wadilizesiwegokadokepub.pdf
    • https://cdn.shopify.com/s/files/1/0436/5985/3977/files/autogenous_healing_of_concrete.pdf
    • https://cdn.shopify.com/s/files/1/0434/8185/8214/files/koratusan.pdf
    • https://cdn.shopify.com/s/files/1/0433/0265/0014/files/python_check_if_directory_exists.pdf
    • https://cdn.shopify.com/s/files/1/0429/1241/5897/files/73423286016.pdf
    • https://cdn.shopify.com/s/files/1/0433/2398/1979/files/ruxeruwenabix.pdf
    • https://cdn.shopify.com/s/files/1/0430/1737/1797/files/51096121645.pdf
    • https://cdn.shopify.com/s/files/1/0435/5588/1111/files/xamotafebofilesufusake.pdf
    • https://cdn.shopify.com/s/files/1/0434/0557/4309/files/73542994848.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_off00005f02.bin
a2be4bfbe70ceec383847f6d81304c78e245172e5863918c310e05a49c57e249		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F02 5300 bytes
font_01_sfnt_off00007102.bin
515c702108abe90912a5c3a481dac9fe24d6e050870cf37d862ffcbe93956ae9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7102 10576 bytes
font_02_sfnt_off00009551.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9551 16204 bytes

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