Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44aed5a044a31fc…

MALICIOUS

PDF

38.7 KB Created: 2020-08-24 08:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16534a0565659c3d09351654467ae543 SHA-1: 4991184d190882796019d5960424bbbe8f56aabe SHA-256: b44aed5a044a31fc59b2e596d17ed0a2c441cf565b94f45c47a43fe4ff53b58b
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with the primary link directing to a known malicious redirector service. This suggests a phishing or social engineering attack where the user is lured to click on links that ultimately lead to malicious content. The presence of a link farm further supports this, indicating an attempt to distribute malicious links widely. No scripts were extracted from this sample.

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=bts+dance+video+free
    • http://files.demingradio.net/uploads/1/3/0/9/130969811/vetikekivamefudi.pdf
    • http://sosawi.fayaorphanage.net/uploads/1/3/2/7/132740541/48701.pdf
    • http://zukekepa.theowensgroup.ca/uploads/1/3/0/8/130814995/2837466.pdf
    • http://vuwomozu.artculturevs.org/uploads/1/3/1/3/131379394/debazemololumobug.pdf
    • https://cdn.shopify.com/s/files/1/0433/0484/5465/files/advanced_mathematics_precalculus_teachers_edition.pdf
    • https://cdn.shopify.com/s/files/1/0427/9002/7430/files/pipogodamabipinax.pdf
    • https://cdn.shopify.com/s/files/1/0438/4063/5042/files/apprendre_le_russe_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0428/3292/0732/files/95065601857.pdf
    • https://cdn.shopify.com/s/files/1/0462/9771/0752/files/animated_ppt_theme_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/4836/2396/files/36685574032.pdf
    • https://cdn.shopify.com/s/files/1/0435/2419/4468/files/flushing_meadow_park_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/6105/9482/files/pepifagegawut.pdf
    • https://cdn.shopify.com/s/files/1/0448/4795/6130/files/44515765692.pdf
    • https://cdn.shopify.com/s/files/1/0450/1300/8534/files/regrouper_plusieurs_ensemble.pdf
    • https://cdn.shopify.com/s/files/1/0433/4216/8218/files/notivunuzigafi.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_off00004e5a.bin
7243dfd7ca1523a71a74945ddcbe52b9b434c61d21e7af391d48228c149562fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E5A 4880 bytes
font_01_sfnt_off00005ef8.bin
7faaf0bc8a21d801624d72575cf51a3de5c522b98224faa045c09ebbb4aed42c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF8 9584 bytes
font_02_sfnt_off00007fe7.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE7 4324 bytes

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