Malicious PDF — malware analysis report

Static analysis result for SHA-256 46aaddae630b3b80…

MALICIOUS

PDF

68.6 KB Created: 2020-08-23 14:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e12a1a5ee525070eebc60ceb232d15a0 SHA-1: 3fc2e4f792bdd548eae3643510f55d0a501aceed SHA-256: 46aaddae630b3b800b7bdb241ac9b690e0a361450cf8dbeca37ce9c603872e41
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL as the malicious redirector. The ML classifier also strongly indicated maliciousness. The presence of a link farm suggests an attempt to game search engines for visibility.

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=arachidonic+acid+formation+definition
    • http://numuwulir.information4felons.com/uploads/1/3/2/6/132695601/sexulotarawu.pdf
    • http://religa.alexblassingame.com/uploads/1/3/0/7/130775934/varuvurak.pdf
    • http://raleluwo.lendalejohnson.com/uploads/1/3/2/6/132682076/masibamapexoderate.pdf
    • http://miwamo.thebridgeriohondo.org/uploads/1/3/1/6/131636948/2055849.pdf
    • https://cdn.shopify.com/s/files/1/0434/1963/1765/files/27168029385.pdf
    • https://cdn.shopify.com/s/files/1/0436/8472/4889/files/39008783572.pdf
    • https://cdn.shopify.com/s/files/1/0431/0653/3525/files/free_gate_vpn_apk.pdf
    • https://cdn.shopify.com/s/files/1/0432/5883/9203/files/6310115132.pdf
    • https://cdn.shopify.com/s/files/1/0427/9091/2159/files/14636660658.pdf
    • https://cdn.shopify.com/s/files/1/0431/2544/0669/files/keferivakumapasuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/nesur.pdf
    • https://cdn.shopify.com/s/files/1/0446/3286/6979/files/python_execute_shell_command.pdf
    • https://cdn.shopify.com/s/files/1/0438/0190/3264/files/nufasuk.pdf
    • https://cdn.shopify.com/s/files/1/0436/2112/2211/files/61067241386.pdf
    • https://cdn.shopify.com/s/files/1/0427/5775/0951/files/the_sims_deluxe_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/3015/1330/files/58417807042.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_off0000b71f.bin
cde219fc607e6331230ffbd2496089e8fbcd03b7fdb78284801a11e58f80aebb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB71F 4828 bytes
font_01_sfnt_off0000c746.bin
68d46d9303d9ac1fba2fa6afc2b35e8c7eb4490024c2d679c10b07653282edc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC746 15316 bytes
font_02_sfnt_off0000f6e4.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E4 4324 bytes

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