Malicious PDF — malware analysis report

Static analysis result for SHA-256 af852968c48cc369…

MALICIOUS

PDF

46.7 KB Created: 2020-08-12 12:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6fddce14c598ca8463a3b79a598696b SHA-1: a1a5afe5050101fd74dcbe2d3eecf329bab01196 SHA-256: af852968c48cc369f8db204538fde3e522eb7534ebeb2ea4c710177922d9f97d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=cours+capteur+de+temp%25C3%25A9rature+pdf'. This heuristic, combined with the ML classifier's high confidence score, indicates a malicious intent. The document body, though partially corrupted, contains the same URL and appears to be a lure related to 'temperature sensor courses'. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious content.

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=cours+capteur+de+temp%25C3%25A9rature+pdf
    • http://files.colstripschoolsdigital.org/uploads/1/3/0/7/130739524/2507646.pdf
    • http://mosipiru.ourlittlecountrychurch.com/uploads/1/3/0/9/130969754/8002113.pdf
    • http://files.awstartingfromscratch.com/uploads/1/3/1/0/131070579/714267.pdf
    • http://jifolawu.flowersindeed.com/uploads/1/3/1/4/131437462/dajapago.pdf
    • https://cdn.shopify.com/s/files/1/0435/3641/6936/files/81487988336.pdf
    • https://cdn.shopify.com/s/files/1/0433/7837/6867/files/50338886450.pdf
    • https://cdn.shopify.com/s/files/1/0427/5824/2470/files/41299073159.pdf
    • https://cdn.shopify.com/s/files/1/0429/8306/3715/files/60816211406.pdf
    • https://cdn.shopify.com/s/files/1/0432/7941/7504/files/mokexezurunejurimejabi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2283550224.pdf
    • https://cdn.shopify.com/s/files/1/0434/8785/4749/files/neoliberalism_international_relations.pdf
    • https://cdn.shopify.com/s/files/1/0429/1241/5897/files/31913516887.pdf
    • https://cdn.shopify.com/s/files/1/0435/5552/0673/files/juvumusi.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_off00006c9a.bin
a75efbbc156e0d9834f530de396a4d8cedbe4cf2fdc3dcb4e4d83f388db83097		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C9A 1684 bytes
font_01_sfnt_off000074ee.bin
c857f88e215063db709020c77c6ee63dd894559b70a0aa8d9730b51f7bd3a884		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74EE 5316 bytes
font_02_sfnt_off000086a8.bin
d4f0be83c535c46a4a32a0b8645460cfd7b780f408c8ee934391511583a76c86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86A8 11656 bytes

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