Malicious PDF — malware analysis report

Static analysis result for SHA-256 7965a8c758ca6514…

MALICIOUS

PDF

48.6 KB Created: 2020-08-02 23:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2ddae666b3abcd3d4339f13a47e3f77 SHA-1: 711687ede305bbabfaef9319746ffcef78aeba9b SHA-256: 7965a8c758ca65144cf8fa0cad0c400294baaa3314e4bec694fbe54c97e9fbaf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with the primary one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text, though heavily obfuscated, contains the same redirector URL and a list of other URLs, suggesting a link farm or phishing lure.

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=check+if+child+exists+firebase
    • http://files.heartsower.com/uploads/1/3/2/6/132683140/popusimufudoj.pdf
    • http://files.africanswisslacewholesale.com/uploads/1/3/1/1/131164185/nojidubotemimegake.pdf
    • http://files.wamindaworkingstockdogs.net/uploads/1/3/1/8/131871501/zabepu-raboden-zimuduji.pdf
    • http://files.shoshonearts.com/uploads/1/3/1/8/131856380/rusudezan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6517/2387/files/dobin.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/kadugapokujopipewenarut.pdf
    • https://cdn.shopify.com/s/files/1/0428/7329/0908/files/semekemumotaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0412/4580/files/fidageduvunowav.pdf
    • https://cdn.shopify.com/s/files/1/0428/4763/3575/files/xafujorebapal.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6107/files/jexololizogixulojekusizo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/19836568605.pdf
    • https://cdn.shopify.com/s/files/1/0437/9397/3405/files/wikatobuma.pdf
    • https://cdn.shopify.com/s/files/1/0432/5107/3174/files/tumuxuwajenosafize.pdf
    • https://cdn.shopify.com/s/files/1/0437/3312/3221/files/jolobukorer.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fe4.bin
6c357d7b364e98a496eba7eab46b53d626ec760a899a01a712cdf43af36ddbf3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE4 5288 bytes
font_01_sfnt_off000081d0.bin
3b4f81cdaa7b44726c8a9eb1fcf18f478e11f7a76d11411e4911e09b85c4d164
pdf-font-stream PDF embedded font (sfnt) at offset 0x81D0 6520 bytes
font_02_sfnt_off000093c3.bin
bf4b366711bb5314c08cb79c2450d1afeb5a5dc48b9715561720f2f7920a1c77
pdf-font-stream PDF embedded font (sfnt) at offset 0x93C3 9360 bytes