Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25182dec6c176eb…

MALICIOUS

PDF

44.2 KB Created: 2020-08-09 16:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e89494eb7c71ae2a41bfe2cf51d91c5 SHA-1: 4d3c99f5fb859cb52753e1dc4f20f77a23d0d592 SHA-256: e25182dec6c176eb72e7e0672e0b6a9f2e94cf5ee60050cfd50aa65154e47378
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/pify?keyword=cover+letter+for+bank+job+pdf'. This URL is presented within the document body, disguised as a job-related document, indicating a social engineering lure. The presence of a large number of external PDF links further suggests a link farm or redirection tactic. The ML classifier also strongly flagged this PDF as malicious.

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=cover+letter+for+bank+job+pdf
    • http://files.homeandhope.net/uploads/1/3/1/4/131438274/motijagapazijug-kafumeposonox-zefumikin-mejir.pdf
    • http://files.lcpsociety.com/uploads/1/3/1/3/131398224/sofev.pdf
    • http://files.maritimereunion64.com/uploads/1/3/1/3/131379266/bemidonuvirimu-wolerobu.pdf
    • https://cdn.shopify.com/s/files/1/0446/8441/1033/files/wings_of_fire_book_1_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/9328/7331/files/vuzupilalixagujaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/fobipaxu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5451/files/jikomivowaledin.pdf
    • https://cdn.shopify.com/s/files/1/0433/3492/6495/files/39599246549.pdf
    • https://cdn.shopify.com/s/files/1/0434/2172/8930/files/jepim.pdf
    • https://cdn.shopify.com/s/files/1/0437/6274/5501/files/91277013462.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupesuditijativerawepafu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5881/3342/files/bhagavad_gita_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7833/6165/files/zafuwimixupa.pdf
    • https://cdn.shopify.com/s/files/1/0435/9821/7378/files/17997180372.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_off000061c7.bin
0c00727d7b9bcd18252d381aeb0828366d48d343b03da582e3f66d5d7051633c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61C7 4960 bytes
font_01_sfnt_off000072c2.bin
e31ceca0218a6e22b96f55d7fb01fc615e8feacc6956720203b19cbfe583d807		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C2 10400 bytes
font_02_sfnt_off00009635.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9635 4324 bytes

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