Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a177a716eee19e…

MALICIOUS

PDF

43.5 KB Created: 2020-08-04 13:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e33dacbaadf901ef2c486b87fb6c2782 SHA-1: ae7eef42b901833ba5d9f704f171b9749198537f SHA-256: f9a177a716eee19e4439583512c1130221a1c5ff03c1f22b251258979c239b79
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector, masquerading as academic content. The primary malicious URL is ttraff.ru, which redirects to other PDF hosting sites, likely for SEO poisoning or to obscure the final destination. The ML classifier strongly indicated maliciousness, and the PDF structure itself points to a link-based attack.

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=readings+for+a+history+of+anthropological+theory+erikson+pdf
    • http://files.uctcsrts.com/uploads/1/3/0/7/130775373/dexutewabisagis_xilofadur_penixikijitava.pdf
    • http://files.avalonschools.org/uploads/1/3/0/7/130739945/5581807.pdf
    • http://files.butlercoconcernedcitizens.org/uploads/1/3/0/9/130969950/fubejijenowufem.pdf
    • http://files.neworleansmidwives.com/uploads/1/3/0/7/130740323/wolizer.pdf
    • https://cdn.shopify.com/s/files/1/0432/0831/0943/files/77351219675.pdf
    • https://cdn.shopify.com/s/files/1/0430/8752/8103/files/pugixuxabava.pdf
    • https://cdn.shopify.com/s/files/1/0429/5655/4394/files/juvirojodeluvajesokikof.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/11241365759.pdf
    • https://cdn.shopify.com/s/files/1/0436/1850/0765/files/79586296357.pdf
    • https://cdn.shopify.com/s/files/1/0438/4253/5574/files/65723089049.pdf
    • https://cdn.shopify.com/s/files/1/0438/7084/7131/files/puxanumiga.pdf
    • https://cdn.shopify.com/s/files/1/0434/5570/9341/files/pitotewupelovogeje.pdf
    • https://cdn.shopify.com/s/files/1/0429/9777/6543/files/bekejizugema.pdf
    • https://cdn.shopify.com/s/files/1/0432/7594/4091/files/ruzixas.pdf
    • https://cdn.shopify.com/s/files/1/0433/0913/8084/files/lenewijuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/5253/0845/files/vevegezuzefobetezoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/2070/6204/files/rosonojakukoliner.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_off00005dce.bin
92f233d03133411c3431c93a85c0596ed237cc2afb90240e245f1dd9b3e75f32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DCE 5380 bytes
font_01_sfnt_off00007015.bin
052d9dbc5fbfb9dab49ddbe3aee0f5a8673cbfc120be8d8cdfe71fbd4c3d5db5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7015 10024 bytes
font_02_sfnt_off0000924d.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x924D 4324 bytes

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