Malicious PDF — malware analysis report

Static analysis result for SHA-256 00277381099135db…

MALICIOUS

PDF

43.2 KB Created: 2020-08-17 16:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3313f86e12ef3d456730e1b7fe3b57b SHA-1: 891f576ba8db54ad2f724c7127f97c897efdfe1b SHA-256: 00277381099135db924ec4bb90a059bb2aa5a733ff2c63b4cab345ddcc8f8feb
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.com/pify?keyword=torsion+in+gastropods+pdf`. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lure users into clicking malicious links, potentially leading to further compromise.

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=torsion+in+gastropods+pdf
    • http://files.eravintagewear.com/uploads/1/3/1/4/131412858/gopomalopaponokalo.pdf
    • http://bomisiguz.susangilmoreart.com/uploads/1/3/2/6/132682924/5610770.pdf
    • http://files.centurycentralteamroping.com/uploads/1/3/1/0/131070483/kikudusujik_gujodem_tatagubegid.pdf
    • http://files.touchofego.com/uploads/1/3/0/7/130775261/ledusogi_wuxujobajod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0447/9103/8118/files/9133246133.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gokibaleginasesomedusuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/1094/8254/files/bazagokimaborakuduzom.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/45725428104.pdf
    • https://cdn.shopify.com/s/files/1/0435/6158/2755/files/compressor_mac_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/8370/1151/files/the_long_dark_heavy_hammer.pdf
    • https://cdn.shopify.com/s/files/1/0431/2779/9957/files/sony_rx100ii_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/1653/4685/files/xuxadopitil.pdf
    • https://cdn.shopify.com/s/files/1/0429/3335/4659/files/16972650285.pdf
    • https://cdn.shopify.com/s/files/1/0438/4571/4077/files/nufijuxikusipa.pdf
    • https://cdn.shopify.com/s/files/1/0432/6028/0982/files/smb_conf_example.pdf
    • https://cdn.shopify.com/s/files/1/0427/5788/2022/files/zomatosedegabuzipa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9980/0217/files/37913399547.pdf
    • https://cdn.shopify.com/s/files/1/0435/5565/1743/files/zopixexodujifupuxijof.pdf
    • https://cdn.shopify.com/s/files/1/0434/6498/2693/files/tuxagukixasozojazixota.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068bf.bin
d62777f315602ee5434ecdecbfd6d0bc3a719b1765c36f820665ea61236fe5ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68BF 5124 bytes
font_01_sfnt_off00007a3f.bin
d36ced23f569fb35f5d5bc81f23a18f785898cd7bc5838aac135306db95b3711		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A3F 10956 bytes

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