Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c4e9cdb4a7c315…

MALICIOUS

PDF

46.1 KB Created: 2020-08-24 08:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd0e205b3413bf0f5aeca4743d6fd409 SHA-1: 0ba3b32648bba8c200864fbf077369acff9fe319 SHA-256: 55c4e9cdb4a7c31571353a677c34f4d75e25018e7ec01897b56377f7fda3d5da
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, characteristic of a link farm designed to manipulate search engine rankings or distribute malicious content. One of these links, https://ttraff.ru/pify?keyword=banjara+song++naa+songs, is identified as a known malicious redirector. The document body itself is largely unreadable, but the presence of the link farm and the malicious redirector strongly indicate a phishing or malware distribution attempt.

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=banjara+song++naa+songs
    • http://nisak.suttas.com/uploads/1/3/0/8/130873863/nategibamezo_sivabasor_pifazuj_rexerufonugured.pdf
    • http://files.iancleggwalsh.net/uploads/1/3/1/6/131637701/mijojemeg-mojuzugetu-xujazewizufovo.pdf
    • http://neniji.melbatheater.org/uploads/1/3/1/3/131383314/kekalevaxito.pdf
    • http://files.reikiwithlouise.com/uploads/1/3/2/7/132712093/fuzerepip_judazasobelof.pdf
    • https://cdn.shopify.com/s/files/1/0437/2915/8295/files/13565017693.pdf
    • https://cdn.shopify.com/s/files/1/0430/8982/1845/files/55142225090.pdf
    • https://cdn.shopify.com/s/files/1/0438/0744/1053/files/bescherelle_vocabulaire_espagnol.pdf
    • https://cdn.shopify.com/s/files/1/0429/6117/4687/files/69340170071.pdf
    • https://cdn.shopify.com/s/files/1/0433/9525/2374/files/81252845147.pdf
    • https://cdn.shopify.com/s/files/1/0430/9729/2949/files/partnership_agreement_editable.pdf
    • https://cdn.shopify.com/s/files/1/0433/4016/9384/files/3449939502.pdf
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/davitut.pdf
    • https://cdn.shopify.com/s/files/1/0431/7220/0608/files/26093125710.pdf
    • https://cdn.shopify.com/s/files/1/0439/1125/0075/files/3272794367.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/
    • https://cdn.shopify.com/s/files/1/0429/6117/4687/files/69340

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005639.bin
e04884e239d916c0ee9977b4b7c0c72bd21048c11c5b0b604904b2cb6008ed00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5639 4944 bytes
font_01_sfnt_off0000671e.bin
f8c85a6244a00b37f2f33292a5f5a875cc54ee028bd2eb7f8389a16eb038146d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x671E 14288 bytes
font_02_sfnt_off0000939a.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x939A 16204 bytes

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